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Why do we measure time the way that we do

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Why do we measure time the way that we do

  1. 1. Day and Night  Caused by the spin of the Earth on its axis  Takes about 24 hours for the Earth to make one rotation
  2. 2. Weeks  7 days for the…  7 non star visible objects in the sky  Although not all connections are obvious in English! Day Object Sunday Sun Monday Moon Tuesday Mars Wednesday Mercury Thursday Jupiter Friday Venus Saturday Saturn
  3. 3. Months  Month sounds like moon!  Even though the moon takes about 29.5 days to revolve around the Earth and our months are usually 30-31 days, we based months off of the moon!
  4. 4. Years  Years are based on how long it takes the Earth to make one complete orbit around the sun  It takes the Earth 365.2422 days to orbit the sun  Because of that, we have leap year every four years  On years that end in a 00, it must also be divisible by 400 to be a leap year (1900 was not a leap year but 2000 was).
  5. 5. Years  Years are based on how long it takes the Earth to make one complete orbit around the sun  It takes the Earth 365.2422 days to orbit the sun  Because of that, we have leap year every four years  On years that end in a 00, it must also be divisible by 400 to be a leap year (1900 was not a leap year but 2000 was).

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