Johannes Kepler

1. worked to publish and present Tycho Brahes data in astronomy after his death in 1601

2. worked with galileo galilei.

1. created Kepler's conjecture, a way of packing spheres so that they take up as little space possible.

(74% of actual area)

2. Found prof that planets have elliptical orbits over circular ones.

3. created 3 laws of planetary motion

A) a planets orbit is an ellipse with the sun at one of the two foci.

B) a line joining a planet and the sun sweeps over equal areas during equal intervals of time.

C) the square of the time it takes a planet to orbit the sun is proportional to the cube of the average distance from the sun to that planet.

4. Major advancements in optics and understanding of how the eye forms pictures.