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AncientAstronomyNotes February15,2017
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AncientEgyptianAstronomyvideo
Hipparchus(2ndcenturyB.C.)createdstarcharts(850stars)dividedin6groupsbybrightness,determinedlengthoftheyear(withinminutes),andpredictedlunareclipses(withinhours)
AncientAstronomyNotes February15,2017
Ptolemy video
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