Kepler’s Laws1. The planets move about the sun in elliptical orbits, with the sun at one focus. 2. The straight line joining the sun and a given planet sweeps out equal areas in equal intervals of time. 3. The square of the period of revolution of a planet about the sun is proportional to the cube of its mean distance from the sun. For the Earth: (Derivation) Fc=Fgms&(4±2RT2) =GmEms&R2(for circular orbits) (* s = satellite) KE=R3T2=GmE4±2=1.01x1013m3/s2For sun satellites ( e.g. planets, asteroids, etc.)
This preview has intentionally blurred sections.
Sign up to view the full version.