physics (the moon)

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  • Created by: Kat
  • Created on: 25-03-13 09:44

Observing the sky:

  • a sidereal day is the time takem for the eath to spin once.
  • if you looked at the night sky for long enough you'd see distance stars appear to cross the sky from east to west.
  • astronomers have known for years that its not the stars that move, but the earth that spins on its axis. 
  • a sidereal day is the time taken for a star to return to the same position in the sky. its about 23hrs and 56 minutes.

the sun and moon appear to cross the sky at different speeds.

  • its not the stars- the sun and moon also appear to cross the sky from east to west.
  • the sun seems to move more slowly across the sky than distance stars-it takes 24 hours to get to the same…

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