lecture_tan8 - 1. 2. 3. 4. 5. 6. 7. 8. 9. Admin. 1/25/11...

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Admin. 1/25/11 1. Class website http://www.astro.ufl.edu/~jt/teaching/ast1002/index.html 2. Discussion sections: Tuesday 1.55pm (period 7), Bryant 3 Wednesday 10.40am (period 4), Bryant 3 Thursday 3.00pm (period 8), Bryant 3 Office hr: Thursday (5pm), Bryant 302 3. Homework 2 due Sun. 1/30/11 by 11pm via Sakai e-learning. Keep a record of your answers to check against the solutions (posted later) 4. Reading this week : Chapters 0, 1, 2.1-2.4, 4.1, 5, 6 5. Email me Astro - news, jokes, tunes, images: ast1002_tan@astro.ufl.edu 6. Print out class notes and bring them to class - use these as a base outline to take extra notes in class. 7. Make a name tag and use it in class. 8. Observing report - go to campus observatory on one Friday at 8.30- 10pm. See instructions on class website. 9. Midterm 1, Thursday 10th February in class. Key Concepts: Lecture 8 Contribution of Tycho Brahe: detailed observations of the planets. Kepler and his 3 Laws of Planetary Motion Galileo Tycho Brahe (1546-1601) Danish born member of nobility Stolen by his uncle, who adopted him as his own son. Trained as a lawyer but secretly studied astronomy after being impressed that mortals could predict astronomical events. Very arrogant and hard to get along with and played the role of a courtly prince with a gold nose. Supported by the King Frederick II of Denmark he built an observatory on the island of Hven financed by one ton of gold His adopted father had saved Frederick from drowning, but then died of pneumonia. Tycho’s Observations He made a long series of very precise observations of the motions of the planets – Very accurate since they were made with a very large quadrant circle (<0.5 arc minute) [1 degree = 60 arc minutes i.e. we write this as 1 ° = 60´] – Made repeated observations and took the average to reduce the errors – Made observations over many years 1576- 1591 – Realized the motions of planets did not match the predictions of Ptolemy
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Tycho’s Supernova The supernova of 1572 – Noticed a brilliant star had appeared in constellation of Cassiopeia – Observed that it faded slowly over the following 2 years – Demonstrated that the universe was changing and imperfect – Showed that it had the same position no matter where on Earth it was observed - thus it was at a great distance. Tycho’s Supernova today d=7500 light years How big is the supernova remnant? This picture taken in year ~2000A.D. How fast is the blast wave moving? Tycho’s Cosmology Didn’t agree with the Copernican system Placed the Earth at the center because: – He could not measure parallax of stars – He believed in Aristotelian physics Realized that the Ptolemaic system didn’t work He came up with a compromise – Stationary Earth at center – Sun moves around the Earth – All other celestial bodies move around the Sun – His model worked no better than Ptolemy’s - Needed better mathematics Kepler (1571-1630)
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lecture_tan8 - 1. 2. 3. 4. 5. 6. 7. 8. 9. Admin. 1/25/11...

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