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Period: Jan 1, 1000 to
Planitary Motion
the first date is actuly 1000 bc -
Dec 19, 1400
classing of stars by Hipparachus
he would class them base off of thier brightness -
May 1, 1500
seasons
summer is marked on june 21 because it is the longest day.
winter is marked on December 21 because it is the shortest day. -
Pyrimids
Built by egyptions to alighn sertin stars -
planets move at constent speed- Aristatle
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Eratoshenes- caculated cercumfrence of the earth