Ast15
1-31-24
Helocentric modle
nicholas -Clamed the Sun was at the center of our
Capernicous (1473-1543
Didnt match observations
-planets move incircles
solar system
-Tycho most Brahe ArcTRate (1546-1601) naked eye observations of
Planet position.
- Saw a New Supernova)
heavens
Could notmacher Parallax 7 Earth
wore
Can't
move
Charging
Johannes keplet (1571-1630)
.
-used Ty cho's Data to show planets move inEccipses
around the Sun.
keplers 3 Laws of Planetary motion.
/ orbits of planets are Ellipses with the Sun at oneFoonse.
Eccentricity=e
=e
for Corilar
For
2
A planet Sweeps out Equail area in Equal time
( moves Fast when its Close to the Sun f then slow
when is Far away
3
A Planet's OrBital period (e) Squared is called
to its A erage distance From the Sun (a) Cubed
G9
