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by theunamedguy 2001 days ago
This is getting at the idea behind the Fourier transform. 3b1b did an excellent video with exactly this visualization:

https://www.youtube.com/watch?v=spUNpyF58BY

The idea is that wrapping a function around a circle at the right frequency (i.e. length per spiral) will cause peaks and troughs to align. It just happens here that the "right" frequency is 1/year.