11 - Lecture 3 Tycho Brahe (1546- 1601) Greatest observer...

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1/12/11 Tycho Brahe (1546- 1601) Greatest observer of his day Recorded accurate positions of planets – unprecedented 1 arch- minute accuracy Observed a supernova in 1572 Exploration: Angles on the Sky We measure the sky in angles, not distance Full circle = 360° 1°= 60 arcmin 1 arcmin = 60 arcsec Johannes Kepler 91571-1630) greatest theorist of his day deeply religious force makes the planet move 3 laws of planetary motion Kepler reviese the model of the universe based on Tycho's data Orbits can be non circular 1 st Law: Each planet's orbit around the Sun is an ellipse, with the Sun at one focus aphelion is far from the star, perihelion is close to the star 2 nd law: Planet's orbital motion sweeps out equal areas in equal intervals of time. Near perihelion, in 30 days a planet sweeps out an area that is short bu wide. Near aphelion 30 days a planet sweeps out an area that is long but narrow
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11 - Lecture 3 Tycho Brahe (1546- 1601) Greatest observer...

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