Notes - Test 2 - I take written notes these are typed up...

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I take written notes, these are typed up notes from those written notes. Days missing from these notes: Sep. 26, Oct. 19, 21 Tycho Brahe (1546-1601, Danish) – greatest pre-telescopic observational astronomer. Never accepted that Earth moved 1572 – Spotted a new star (nova) showed by measuring its parallax that it must be far above the moon, thus contradicting Aristotle's doctrine of that the Heavens are eternal and unchanging. 1576- Danish king granted the island of Hven to Tycho as site for a new observatory: Uraniborg. There Tycho and his assistants made accurate and systematic observation of the positions of the stars and planets. 1577 – Tycho showed that the path of a comet crossed the orbits of the planets, concluded that “crystalline spheres” could not be solid. 1580 – Tycho formulated geo-heliocentric “Tychonic” system: planets circle the Sun, which circles the stationary Earth. This was more unified than the Ptolemaic system while avoiding physical absurdity of Copernicus's idea of a moving Earth. After about 1600, Ptolemy's system passed from favor among astronomers; the real contest in the 17 th cent. Would be between Tycho's system and Copernicus's. 1597 – After various conflicts, Tycho left Hven; eventually appointed Imperial Astronomer/Astrologer Kepler (1571-1630, Germany) student at University of Tuebingen taught by Michael Maestlin 1595 – Kepler noticed that the spheres of the 6 Copernican planetary orbits (nearly) fit w/in or around the five perfect Platonic solids; formulated his theory of 'nested polyhedra'. Kepler saw this as a deep link between abstract geometry and the real structure of universe; wrote it up in explicitly pro- Copernican book, Mysterium Cosmographicum (1596). Was this a good theory? What should a good scientific theory try to do? -simply codify observed regularities? -lay bare the true physical mechanism He loved his perfect solids theory of the universe (oh kepler) Loved God's ideas (thought this was God's idea) He would throw out data that struck against his theory -but hang onto data that helped it God gave us everything we needed to understand the universe. He maintained faith in this system throughout his life. 1600- Kepler joined Tycho's staff at Prague and set out to 'solve' the motion of mars. He published his revolutionary results in his Astronomia Novia (1609) Tychonic <--Tycho an Observer, Kepler a mathmatecian → Copernican Kerpler couldn't fit Tycho's data into traditional methods of eccentrics, equants, and epicycles. Mars had the most difficult path to plot. Mars is the only planet that can't have it's orbit explained in
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perfect circles. Kepler proposed anew model and physics, He used the Equal area law -God has given us Tycho Brahe's measurements, we should trust them Kepler after throwing out circles felt he could fit them in ellipses. Harmonics Mundi (1619)
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Notes - Test 2 - I take written notes these are typed up...

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