Hipparchus came up with magnitude
The moon is 240,000 miles away.
Ptolemy is one of the most famous astronomers.
Nova means new in Latin.
Kepler's three laws of planetary motion.
1. Planets move ecliptically (egg shaped)
2. Planets do not move at constant speeds but speed up when closer to the sun.
3. A closer planet moves faster than one that is farther than the sun.
Hans Lippershy built first telescope.
Newton- gravitation, nature of light, color, calculus.
