System Astronomers Use to Describe the Sky
The answer took a while for astronomers to figure out leading to a debate between what is known as the geocentric Earth-centered model and the heliocentric Sun-centered model. Egyptian astronomy began in prehistoric times in the Predynastic PeriodIn the 5th millennium BCE the stone circles at Nabta Playa may have made use of astronomical alignments.
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By the time the historical Dynastic Period began in the 3rd millennium BCE the 365 day period of the Egyptian calendar was already in use and the observation of stars was important in determining the.
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The Sky Above Astronomy The Sky And The Solar System
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