The recent winter solstice, and reading some stories set in ancient Rome, got me thinking about the geocentric model of the universe and some potential problems with it (yes, I know it’s wrong)
Googling around finds accounts that deal with acknowledged problems of planetary retrograde motion and the varying brightness of planets. But I am also wondering;
- How did they account for the differing length of day-light hours over a year? Was the sun’s sphere (alone?) supposed to ‘wobble’?
- The model puts the sun farther away from the earth than the moon. Yet the moon orbits once a month while the sun orbits daily. They acknowledge different spheres rotated at different speeds; but did anyone calculate what the speed of the sun would have to be? It would seem to be a phenomenal figure.