Lecture 11: The Calendar20 years ago

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Lecture 12: The Wanderers - Planetary Motions20 years ago

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Lecture 13: Greek Astronomy20 years ago

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Lecture 15: The Watershed: Tycho and Kepler20 years ago

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Lecture 16: Galileo and the Telescope20 years ago

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Lecture 19: Orbits20 years ago

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Lecture 20: Tides20 years ago

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