this post was submitted on 19 May 2026
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xkcd
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They show an example in the video, it's just swapping the equator and the prime meridian. Hence why Britain (self-declared center of the world at GMT+0) ends up on the new equator.
The more detailed article on XKCD's site specifies they're using the Cassini Projection:
https://en.wikipedia.org/wiki/Cassini_projection