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This book was so popular during the lifetime of the original author that it went through six editions. This reprinting o
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The Gregorian calendar reform of 1582, which provided the basis for the civil and Western ecclesiastical calendars still
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This is the only book I've been able to find on the history of the Gregorian Calendar reform. UPDATE: I found this:
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Valued today for its development of the third law of planetary motion, Harmonice mundi (1619) was intended by Kepler to
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Finding all the fascinating scientific sites to visit throughout America can be a daunting task. This guidebook does all
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