Editing Talk:1248: Sphere
![]() |
Please sign your posts with ~~~~ |
Warning: You are not logged in. Your IP address will be publicly visible if you make any edits. If you log in or create an account, your edits will be attributed to your username, along with other benefits.
The edit can be undone.
Please check the comparison below to verify that this is what you want to do, and then save the changes below to finish undoing the edit.
Latest revision | Your text | ||
Line 2: | Line 2: | ||
:Astronomers observe objects in the sky, not the Earth.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 11:19, 7 August 2013 (UTC) | :Astronomers observe objects in the sky, not the Earth.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 11:19, 7 August 2013 (UTC) | ||
::Astronomers live on the surface of the Earth, not on the surface of the sky (celestial sphere). [[Special:Contributions/167.107.191.217|167.107.191.217]] 13:25, 7 August 2013 (UTC) | ::Astronomers live on the surface of the Earth, not on the surface of the sky (celestial sphere). [[Special:Contributions/167.107.191.217|167.107.191.217]] 13:25, 7 August 2013 (UTC) | ||
− | |||
Are you sure “Sphere” refers to “hemisphere” and not simply to earth? After all, she’s trapped on earth and not on the celestial sphere. [[User:Quoti|Quoti]] ([[User talk:Quoti|talk]]) 11:24, 7 August 2013 (UTC) | Are you sure “Sphere” refers to “hemisphere” and not simply to earth? After all, she’s trapped on earth and not on the celestial sphere. [[User:Quoti|Quoti]] ([[User talk:Quoti|talk]]) 11:24, 7 August 2013 (UTC) | ||
Line 28: | Line 27: | ||
:She does mention a sphere, so I changed it back. No hard feelings (I hope). –[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 18:29, 7 August 2013 (UTC) | :She does mention a sphere, so I changed it back. No hard feelings (I hope). –[[User:St.nerol|St.nerol]] ([[User talk:St.nerol|talk]]) 18:29, 7 August 2013 (UTC) | ||
::I don't mind, but it seems I'm the only astronomer and physicist here.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:13, 7 August 2013 (UTC) | ::I don't mind, but it seems I'm the only astronomer and physicist here.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:13, 7 August 2013 (UTC) | ||
− | |||
After some more thoughts on this, why nobody (even myself) did raise the idea that Randall talks about both interpretations? Nevertheless, if the sphere is interpreted as the surface of the Earth there is a need to explain the geoid discrepancy to an ideal sphere, as mentioned in the very first post here.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:51, 7 August 2013 (UTC) | After some more thoughts on this, why nobody (even myself) did raise the idea that Randall talks about both interpretations? Nevertheless, if the sphere is interpreted as the surface of the Earth there is a need to explain the geoid discrepancy to an ideal sphere, as mentioned in the very first post here.--[[User:Dgbrt|Dgbrt]] ([[User talk:Dgbrt|talk]]) 19:51, 7 August 2013 (UTC) | ||
Line 34: | Line 32: | ||
This "a sphere is a surface and has no surface" is too much nitpicking. Wikipedia (http://en.wikipedia.org/wiki/Sphere) talks about calculating the surface area of a sphere. I think "surface of sth" is not very rigorously defined. Often two dimensional manifolds are called surfaces, and a sphere is one, and the surface (different meaning) of the earth is roughly a sphere. What a sphere doesn't have is a border. [[User:Peter|Peter]] ([[User talk:Peter|talk]]) 11:54, 8 August 2013 (UTC) | This "a sphere is a surface and has no surface" is too much nitpicking. Wikipedia (http://en.wikipedia.org/wiki/Sphere) talks about calculating the surface area of a sphere. I think "surface of sth" is not very rigorously defined. Often two dimensional manifolds are called surfaces, and a sphere is one, and the surface (different meaning) of the earth is roughly a sphere. What a sphere doesn't have is a border. [[User:Peter|Peter]] ([[User talk:Peter|talk]]) 11:54, 8 August 2013 (UTC) | ||
− | |||
The is trapped on the surface of this sphere, since you can walk on it forever, without ever leaving it[[User:Oscar|Oscar]] ([[User talk:Oscar|talk]]) 12:20, 8 August 2013 (UTC) | The is trapped on the surface of this sphere, since you can walk on it forever, without ever leaving it[[User:Oscar|Oscar]] ([[User talk:Oscar|talk]]) 12:20, 8 August 2013 (UTC) | ||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− | |||
− |