Astronomers

Who catalouged the positions of 850 stars, and founded the stellar magnitude we still use today?

Who represents planetary motion through interlocking circular orbits with Earth as the center?

This person was thought to have edited book 3 of Ptolemy's Almagest, a manual on the motion of the stars and planets.

Showed the sun at the center of the universe

Shattered the belief that the Universe beyond the moon was unchanging

Constructed simple refracting telescope

Discovered planets have elliptical orbits

Was the last astronomer to do major work without aid of telescope & catalogued 1,564 stars

Discovered 4 of Saturn's moons, lapetus, Rhea, Dione, and Tethys

Remembered for their work on gravity and optics