A reference point.
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"change in location" "displacement"
A change in an objects position relative to a reference point is called motion.
tables tabulating the earthly position of notable objects in the sky at various times they're useful to sky watchers for research or observing pleasure and for people at sea who use the position of objects in the sky to figure out where they are
A change in position in a certain amount of time is called motion.
The specific location or arrangement of continuing or successive objects or events in space or time.