The Copernican Revolution from AST....

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Front (Question)

The Copernican Revolution

Back (Answer)

Nicolaus Copernicus (1473-1543)

He thought Ptolemy's model was contrived
Yet he believed in circular motion
De Revolutionibus Orbium Coelestium

Copernicus' Heliocentric Model

Sun is at centre
Earth orbits like any other planet
Inferior planet orbits are smaller
Retrograde motion occurs when we "lap" Mars & the other superior planets

Tycho Brahe (1546-1601)

Greatest observer of his day
Uraniborg
Charted accurate positions of planets

Johannes Kepler (1571-1630)

Greatest theorist of his day
a mystic
there were no heavenly spheres
forces made the planets move

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