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# lecture5 - Lecture 5 Tycho and Kepler The importance of...

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Lecture 5 Tycho and Kepler: The importance of Accuracy

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Lecture 5: Brahe and Kepler Tycho Brahe (1546-1601) was born 3 years after death of Copernicus. Learned in 1563 that observations on which Ptolemaic and Copernican models were based were inaccurate ( +/- 15 arcminutes or so). Built large instruments which allowed positions to be measured to better than +/- 2 arc minutes. He estimated his errors and noted them with his observations. He observed continuously for 20 years, recording all planetary positions and not just positions at quadrature and opposition .
Time between successive oppositions is the Synodic Period. The other planet's sidereal period follows from this: 1/Syn.Per. = 1/P(earth) - 1/P(planet)

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Figure 2.25: Synodic vs. sidereal period of a planet 1/Syn.Per. = 1/P(earth) - 1/P(planet)
Determining radius of an outer planet's orbit. Fig. 2-26

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Tycho Brahe: The Importance of Accurate Observations 1. The quality of his observations led Tycho to reject the Copernican model because he could
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lecture5 - Lecture 5 Tycho and Kepler The importance of...

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