Question:

Do the constellations (stars) appear to shift east or west each day as seasons go by?

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How much do stars appear to shift each day? Why?

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  1. Stars and constellations rise earlier each night.  That's a shift to the west.  The apparent motion is due to the Earth's motion around the Sun.  They should shift by about 1/365th of 360 degrees per day, which is something like one degree.


  2. writer -

    Suitti is correct. The constellations move about 1 degree to the west on each consecutive night as viewed from a static location at the same time each night.

    Think of it this way. As the earth moves around the sun, the night side is always facing outward, away from the sun. As the earth orbits, that outward looking direction is changing each night, sweeping out an arc in the sky pointing away from the sun. Since the earth is swinging around the sun toward the east, the constellations appear to move toward the west.

  3. yes as the earth rotates throught a year we see the stars from a different angle.

    therefore there are different constelations for every season...

    http://www.astro.wisc.edu/~dolan/constel...

    this also explains horoscopes.

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