3 ms·
Before we understood that the planets orbit the sun (more or less), astronomers thought they orbited the earth, and tried to explain these paths using epicycles
by twic 7y ago
Before we understood that the planets orbit the sun (more or less), astronomers thought they orbited the earth, and tried to explain these paths using epicycles - note the diagram halfway down:
https://en.wikipedia.org/wiki/Deferent_and_epicycle https://en.wikipedia.org/wiki/Deferent_and_epicycle
- jacobush 7y ago... which always make me think of my limited understanding of string theory. :-) (Which can be summed up into "something something resonance something something dimensions".)