1. Topics: Brahe & Kepler Ellipses Kepler’s Laws
The “NOSE” Have It!
Topics:
Brahe & Kepler
Ellipses
Kepler’s Laws

2. Tycho Brahe (1546-1601) Danish Nobility. Astronomer
Had a nice mustache?

3. King Tycho?
He built a castle with a HUGE observatory on the island.

4. Brahe’s Mission Brahe wanted to verify the Copernican model.
He was in search of PARALLAX!
He was able to collect tons of data without a telescope!

5. In the process….
He made observations of a supernova (nova = new star) in 1572.
He made careful observations of a comet in 1577 and showed that it was further away than the moon.
How did these observations and findings rock the Aristotelian theories?

6. Brahe’s Blunder?
Ultimately, Brahe couldn’t find any stellar parallax. As a result, he concluded (correctly) that one of the following must be true:
The Earth was motionless at the center of the Universe.
The stars were so far away that their parallax was too small to measure.

7. Brahe’s Universe Universe
Chose to revert to a Geocentric model!
Earth at the center….planets revolve around the sun!

8. Kepler (1571-1630) Mathematician Astrologist Astronomer
Big on Copernican model!

9. Kepler’s Universe… Included the FIVE PLATONIC SOLIDS!
Included SIX SPHERES…one for each of the six known planets!
Sun at center!

10. Kepler’s Laws