1. Astronomy: The Original Science STUDYING SPACE

2. Modern Calendar Based on observations of bodies in our solar system

3. Day Time required for Earth to rotate once on its axis

4. Month Time required for the moon to revolve once around Earth

5. Year Time required for Earth to revolve once around the Sun

6. TWO CAMPS OF THOUGHT PtolemyCopernicus

7. Sun is center of universe All heavenly bodies revolve around Sun Spurred major changes in science & society Earth is center of universe All heavenly bodies revolve around Earth TWO CAMPS OF THOUGHT PtolemyCopernicus

8. Tycho Brahe Thought the Sun revolved around Earth & other bodies revolved around Sun Made precise observations

9. Johannes Kepler All planets revolve around the Sun Developed 3 laws of planetary motion

10. Galileo Galilei First to use a telescope to observe objects in space

11. Galileo’s Discoveries Craters on moon Mountains on moon 4 moons of Jupiter Sunspots on the Sun

12. Sir Isaac Newton Law of Gravity Explained why all planets orbit the most massive object in solar system - Sun

13. Edwin Hubble Proved that there are other galaxies in universe. Confirmed belief that universe is much larger than first thought.