Clayton Shonkwiler is a user on mathstodon.xyz. You can follow them or interact with them if you have an account anywhere in the fediverse.
Clayton Shonkwiler @shonk

Fall Out

Mapping a rotating circle on the sphere to the plane. Here's the map: first, send (almost every) point on the sphere to the point on the $z=1$ plane contained in the same line through the origin. Then, invert the plane in the unit circle.

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