Lecture 11: The Calendar19 years ago

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Lecture 12: The Wanderers - Planetary Motions19 years ago

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Lecture 13: Greek Astronomy19 years ago

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Lecture 15: The Watershed: Tycho and Kepler19 years ago

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Lecture 16: Galileo and the Telescope19 years ago

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Lecture 19: Orbits19 years ago

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Lecture 20: Tides19 years ago

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