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FROM CONSERVATION OF ANGULAR MOMENTUM
AS NO EXTERNAL TORQUE IS ACTING
I W=CONSTANT WHERE W=ANGULAR VELOCITY
AS EARTH SHRINKS ITS MOMENT OF INNERTIA ABOUT ITS AXIS DECREASES THUS ITS ANGULAR VELOCITY INCRESES AND TIME PERIOD OF ROTATION ABOUT ITS OWN AXIS DECREASE
THEREFOR LENGTH DAYS BECOME SHORTER
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Arun (askIITians forum expert)
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