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In order to observe motion, we adopt a frame of reference in which the observer is thought to be motionless. Nothing is truly motionless; even though I appear to be sitting motionlessly at my desk (not counting my moving fingers as I type) I am on a planet that rotates on its axis once per day and which revolves around the sun once per year, while the solar system as a whole revolves around the center of the milky way galaxy, and the galaxy itself is also moving. I can ignore all of those motions and assume that I am motionless, if that is the frame of reference that I choose.

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Q: What is a frame of reference in science?
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