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The period of rotation is the time interval that elapses before a rotating body reaches the same position in relation to its surroundings .
The earth's rotation period is 24 hours, more precisely: a sidereal day (approx. 23 h, 56 min). If a dancer turns 5 pirouettes in 1 second , his rotation period - averaged - is 1/5 s, i.e. 200 milliseconds.
