Adding epicycles to the circular orbits - an example before Fourier! https://en.m.wikipedia.org/wiki/Deferent_and_epicycle https://en.m.wikipedia.org/wiki/Defe

Adding epicycles to the circular orbits - an example before Fourier! https://en.m.wikipedia.org/wiki/Deferent_and_epicycle https://en.m.wikipedia.org/wiki/Deferent_and_epicycle