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Tycho
Brahe (1546--1601):
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Arguably
greatest observational astonomer of the Renaissance period.
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Did
not have a telescope (hadn't been invented)!
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Measured
planetary positions with nearly 1 arcminute
accuracy
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Tycho
practiced Astrometry
(measurement of the positions of the stars)
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Looking
for Parallax
(use of perspective) to try to measure the distance to the stars.
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