Helocentric modle
Ast115 1-31-24
nicholas Copernicous (1473-1543
-Clamed the sun was at the center of our
Solar System -planets move incircles
-Didnt match observations.
Tycho Brahe (1546-1601)
- most percikate naked eye observations of Planet Position.
-Saw a "new" star Supernova) heavens Could not macher Parallax => Earth wore Can't move Changing
Johannes Kepler (1571-1630)
-used Ty cho's Data to show planets move in Eccipses around the sun.
Keplers 3 Laws of Planetary motion.
Dorbits of planets are Ellipses with the sun at onefoouse. Eccentricity=e 70 for Coril ar *
③ A planet Sweeps out Equail area in Equal time (moves fast when its close to the Sun & then slow when is far away)
③ A Planet's orbital period (1) Squared is called to its Average distance from the Sun (a) Cubed