What periodic motion is used as a reference

AI Thread Summary
The periodic motion used as a reference for a year is the Earth's revolution around the sun, which takes approximately 365.25 days. This motion defines the length of a year in the Gregorian calendar. The discussion seeks clarification on whether there is a different periodic motion being referenced. Participants express confusion over the original question but confirm the Earth's orbit as the standard reference. Understanding this motion is essential for grasping the concept of a year.
Lindseynh
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what periodic motion is used as a reference for our year
hope someone can help i can't seem to find this answer
 
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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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