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Welcome to the explain xkcd wiki!
We have an explanation for all 3228 xkcd comics, and only 75 (2.3%) are incomplete. Help us finish them!
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| Planets and Bright Stars |
 Title text: An old astronomer trick for distinguishing the Sun from other stars is to take multiple photos a few minutes apart and overlay them, making the Sun stand out due to its high proper motion. |
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