1. Circles & Gravity What the heck do they have to do with each other? Astro10/15/08 ©2007 Daryl Taylor DT@DTFizzix.com

3. Intro Stuff (That means “boring stuff..”) Ancient Astronomy Ancient Astronomy –The 1 st REAL Physical Science »Besides “falling over” »Some early views –Ptolemy –Copernicus –Galileo –Kepler! –Newton!

4. Intro Stuff (That means “boring stuff..”) So, where does Tyco Brahe fit in? So, where does Tyco Brahe fit in? –Aristocratic Moron (Autistic) »Died from a burst bladder! –Stayed up EVERY night of his life »Mapping the sky »Keeping data –Volumes & VOLUMES of data

5. Intro Stuff (That means “boring stuff..”) Kepler? Kepler? –Genius - mathematics –Astronomy - hobby –Made a living being an astrologer! –Was puzzled by some things »But, had no data

6. Intro Stuff (That means “boring stuff..”) Stole Tyco’s stuff Stole Tyco’s stuff –Hired a coupla street thugs Studied data for 19 years. Studied data for 19 years. Published his 3 “LAWS” Published his 3 “LAWS” –NO EXPLANATIONS! –Was NOT a real scientist!

7. Intro Stuff (That means “boring stuff..”) 3 LAWS? [Block 4] 3 LAWS? [Block 4] –Ellipses –Equal Areas –K = T 2 / R 3 Math or Science? Math or Science? Video Clip!!! YIPPEE!!! Video Clip!!! YIPPEE!!!

8. Real Stuff 1 st Law (Block 8) 1 st Law (Block 8) –Planets travel in ELLIPTICAL orbits, not circular. –Definitions »Circle – ‘r’ »Ellipse – ‘a+b’ –Why?

9. Circle, duh… R

10. Ellipse, F1F1 F2F2 Earth a b

11. Real Stuff 2 nd Law 2 nd Law –Planet makes  ’s with =A’s. –Say WHAT? –Why? »Gif1&2

12. Real Stuff

13. Aristotle Aristotle

14. Real Stuff Ptolemy Ptolemy

15. Real Stuff 3 rd Law 3 rd Law –K=T 2 / R 3 –Definitions »R»R»R»R »T»T»T»T –AU? »Taylor’s Constant! –Why?

17. Real Stuff Newton’s Synthesis – Bored Board! Newton’s Synthesis – Bored Board!