1. Kepler’s Laws of planetary motion. Ellipse lab

2. Tycho Brahe Tycho Brahe was a Danish astronomer who is best known for the astronomical observations which led Kepler to his theories of the Solar system Most precise observational equipment of time

3. Detailed observation of the movement of Mars which helped Kepler formulate his laws on planetary motion Thought earth was the center of the solar system

4. Johannes Kepler a German mathematician and astronomer Student of Tycho Brahe discovered that the Earth and planets travel about the sun in elliptical orbits. He gave three fundamental laws of planetary motion.

5. Kepler’s 1 st law of planetary motion I. The orbits of the planets are ellipses, with the Sun at one focus of the ellipse. – Sun one of the foci points – 2 nd foci – nothing there – Distance from sun is constantly changing

6. Kepler’s second law of planetary motion The lines joining the planet to the sun sweeps out equal areas in equal times – Planet moves faster when it is near the sun – Perihelion – nearer sun – Aphelion – farther from sun

8. Kepler’s third law of planetary motion Time it takes a planet to revolve around the sun increases with the size of its orbit. http://csep10.phys.utk. edu/astr162/lect/binari es/visual/kepleroldfram e.html