Ast 115
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• Apparent Retrograde motion
= The backward motion of a planet
what we See Backwards
3.2-3.3 Earth-centered VS. Sm-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)
• * GEOcontric madle
-Stars
Planets
Sun
moon
•Ptolemy (100-170A.D) Epicycles
•Round was consederd Perfect.
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