https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&feed=atom&action=historyTalk:1922: Interferometry - Revision history2024-03-28T09:35:37ZRevision history for this page on the wikiMediaWiki 1.30.0https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=168456&oldid=prev172.69.70.137: The other joke about visibilities in interferometry.2019-01-21T20:42:31Z<p>The other joke about visibilities in interferometry.</p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Senstivity WILL be greater than for a single telescope, because you ARE gathering more light. You're not doing it at one detector, but processing both the measurements will allow you to add the images together and then lead to some sort of coherent integration! [[Special:Contributions/172.68.146.56|172.68.146.56]] 03:29, 26 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Senstivity WILL be greater than for a single telescope, because you ARE gathering more light. You're not doing it at one detector, but processing both the measurements will allow you to add the images together and then lead to some sort of coherent integration! [[Special:Contributions/172.68.146.56|172.68.146.56]] 03:29, 26 December 2017 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">----</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">There could be another layer of joke here with the invisible dog representing a nod to the things which interferometers measure: visibilities (ref: https://en.wikipedia.org/wiki/Interferometric_visibility ).</ins></div></td></tr>
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</table>172.69.70.137https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=149861&oldid=prevDgbrt at 20:02, 27 December 20172017-12-27T20:02:45Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
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<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div><del class="diffchange diffchange-inline">==</del>Doubt<del class="diffchange diffchange-inline">==</del></div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">;</ins>Doubt</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Senstivity WILL be greater than for a single telescope, because you ARE gathering more light. You're not doing it at one detector, but processing both the measurements will allow you to add the images together and then lead to some sort of coherent integration! [[Special:Contributions/172.68.146.56|172.68.146.56]] 03:29, 26 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Senstivity WILL be greater than for a single telescope, because you ARE gathering more light. You're not doing it at one detector, but processing both the measurements will allow you to add the images together and then lead to some sort of coherent integration! [[Special:Contributions/172.68.146.56|172.68.146.56]] 03:29, 26 December 2017 (UTC)</div></td></tr>
</table>Dgbrthttps://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=149798&oldid=prev172.68.146.56: Doubt about the sensitivity of the sythesised aperture2017-12-26T03:29:06Z<p>Doubt about the sensitivity of the sythesised aperture</p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
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<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">Senstivity WILL be greater than for a single telescope, because you ARE gathering more light. You're not doing it at one detector, but processing both the measurements will allow you to add the images together and then lead to some sort of coherent integration! [[Special:Contributions/172.68.146.56|172.68.146.56]] 03:29, 26 December 2017 (UTC)</ins></div></td></tr>
</table>172.68.146.56https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148739&oldid=prevNiceGuy1 at 04:57, 5 December 20172017-12-05T04:57:33Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:(*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:(*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.)</div></td></tr>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>NiceGuy1https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148738&oldid=prevNiceGuy1 at 04:56, 5 December 20172017-12-05T04:56:01Z<p></p>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I get the sense that this is it, there's no connection between dogs and astronomy except the one Beret Guy just created. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I get the sense that this is it, there's no connection between dogs and astronomy except the one Beret Guy just created. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:: Have you never heard of the Dog Star?[[Special:Contributions/141.101.104.239|141.101.104.239]] 10:16, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:: Have you never heard of the Dog Star?[[Special:Contributions/141.101.104.239|141.101.104.239]] 10:16, 1 December 2017 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">::: True... Except the Dog Star is something to observe, while the concept being linked is about what's doing the observing. :) Connection seems shaky at best. Now, if there was some recent article about someone using Interferometry to observe the Dog Star, we'd have our connection. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:56, 5 December 2017 (UTC)</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) at two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. In the context of the comic, the dogs are the signal*, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) at two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. In the context of the comic, the dogs are the signal*, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>(*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.)</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">:</ins>(*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>NiceGuy1https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148611&oldid=prev172.68.58.143 at 22:42, 1 December 20172017-12-01T22:42:12Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 22:42, 1 December 2017</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) at two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. In the context of the comic, the dogs are the signal*, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely.  </div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) at two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. In the context of the comic, the dogs are the signal*, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely.  </div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">(</ins>*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.<ins class="diffchange diffchange-inline">)</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>[[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>172.68.58.143https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148610&oldid=prev172.68.58.143 at 22:40, 1 December 20172017-12-01T22:40:28Z<p></p>
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 22:40, 1 December 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l35" >Line 35:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) at two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. <del class="diffchange diffchange-inline">Presumably in </del>the comic, the dogs are the <del class="diffchange diffchange-inline">waves</del>, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely. [[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) at two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. <ins class="diffchange diffchange-inline">In the context of </ins>the comic, the dogs are the <ins class="diffchange diffchange-inline">signal*</ins>, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely.  </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div> </div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins class="diffchange diffchange-inline">*We may assume that both dogs are at the same frequency and therefore constitute one signal for our purposes. It is unclear to me if the dogs are more properly thought of as signal emitters or are simply the measured output of a single wavefront at two different points, but if I think too much harder about this metaphor I may lose my mind.</ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>[[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>172.68.58.143https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148609&oldid=prev172.68.58.143 at 22:30, 1 December 20172017-12-01T22:30:00Z<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 22:30, 1 December 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l35" >Line 35:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'>−</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) <del class="diffchange diffchange-inline">from </del>two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. Presumably in the comic, the dogs are the waves, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely. [[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div>:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) <ins class="diffchange diffchange-inline">at </ins>two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. Presumably in the comic, the dogs are the waves, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely. [[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>172.68.58.143https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148608&oldid=prev172.68.58.143 at 22:29, 1 December 20172017-12-01T22:29:10Z<p></p>
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</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l34" >Line 34:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:: Have you never heard of the Dog Star?[[Special:Contributions/141.101.104.239|141.101.104.239]] 10:16, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:: Have you never heard of the Dog Star?[[Special:Contributions/141.101.104.239|141.101.104.239]] 10:16, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;"></ins></div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">:Srs answer - interferometers have other uses besides astronomy, including quantum physics, radio antennas, direction-finding, and precision measurement. They function by measuring a signal (radio wave, laser beam, w/ever) from two distant points simultaneously, or else by splitting a signal so it travels two different paths to reach a detector. If the difference between the points/paths is such that the wavefronts reach the detector(s) at exactly the same moment, you get "constructive" interference - the waves' peaks and troughs add together and produce a signal of twice the strength. Presumably in the comic, the dogs are the waves, and Beret Guy the detector. Note that if the wavefronts do not arrive in sync you will get partial addition, and/or partial cancellation, or may even produce a perfect cancellation, and get no signal at all. So, presumably if Beret Guy were to move one of the small dogs a little to the left or right, all the dogs would disappear completely. [[Special:Contributions/172.68.58.143|172.68.58.143]] 22:29, 1 December 2017 (UTC)</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>172.68.58.143https://www.explainxkcd.com/wiki/index.php?title=Talk:1922:_Interferometry&diff=148557&oldid=prev108.162.249.76 at 10:52, 1 December 20172017-12-01T10:52:52Z<p></p>
<table class="diff diff-contentalign-left" data-mw="interface">
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<td colspan="2" style="background-color: white; color:black; text-align: center;">Revision as of 10:52, 1 December 2017</td>
</tr><tr><td colspan="2" class="diff-lineno" id="mw-diff-left-l33" >Line 33:</td>
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<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I get the sense that this is it, there's no connection between dogs and astronomy except the one Beret Guy just created. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I get the sense that this is it, there's no connection between dogs and astronomy except the one Beret Guy just created. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:: Have you never heard of the Dog Star?[[Special:Contributions/141.101.104.239|141.101.104.239]] 10:16, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:: Have you never heard of the Dog Star?[[Special:Contributions/141.101.104.239|141.101.104.239]] 10:16, 1 December 2017 (UTC)</div></td></tr>
<tr><td colspan="2"> </td><td class='diff-marker'>+</td><td style="color:black; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;"><div><ins style="font-weight: bold; text-decoration: none;">:Here's the connection: https://en.wikipedia.org/wiki/Canis_Major [[Special:Contributions/108.162.249.76|108.162.249.76]] 10:52, 1 December 2017 (UTC)</ins></div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>Does anyone else notice how in the third panel, HYAH seems to be coming from BG's beret button? What if the beret is controlling him?[[User:MrBookBoy|MrBookBoy]] ([[User talk:MrBookBoy|talk]]) 15:03, 30 November 2017 (UTC)</div></td></tr>
<tr><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td><td class='diff-marker'> </td><td style="background-color: #f9f9f9; color: #333333; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #e6e6e6; vertical-align: top; white-space: pre-wrap;"><div>:I love the observational skills of the XKCD fandom, makes me feel right at home. LOL! You're right, I don't see how there can be any question that it seems like the button is doing the talking. [[User:NiceGuy1|NiceGuy1]] ([[User talk:NiceGuy1|talk]]) 04:19, 1 December 2017 (UTC)</div></td></tr>
</table>108.162.249.76