xkcd #3219: 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.
Transcript:
Transcript will show once it’s been added to explainxkcd.com
Source: https://xkcd.com/3219/
or rescale it and risk creating a singularity