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What periodic motion is used as a reference

  1. Jun 7, 2004 #1
    what periodic motion is used as a reference for our year
    hope someone can help i cant seem to find this answer
     
  2. jcsd
  3. Jun 7, 2004 #2

    mathman

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    Science Advisor

    I am not sure I understand your question, but a year is the time it takes for the earth to complete one revolution around the sun. Are you looking for something else?
     
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