Seudónimo Seudónimo
  • 17-04-2017
  • Physics
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How did humans decide how long a year should be

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breezygurl10030
breezygurl10030 breezygurl10030
  • 17-04-2017

by how long the earth takes to orbit the sun one time


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dfgt
dfgt dfgt
  • 17-04-2017
maya calendar, the four seasons etc
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