Ast 115
1-29-24
Apparent Retrograde motion
= The backWard motion of a planet
whatwe
Backwards
see
3.2-3.3 Earth-centered vs. sun-centered
pyThagors (560 -480 BC)
Thought that the Earth was Round
Aristotle (384-322BC)
-Earth Shadow on the moon was curved = Earth is sverical
I universe has twoparts imperfect changeable Earth
2 Perfect heavens (space)
Found
GEOCONTINC modle
Stars
was consederd
Perfect.
Planets
ptolemy (100-170A.D)
Sun
Epicycles
E
moon
E
1-31-24
