The two motions of the earth have a huge influence on earth, rotation is the major cause for the existence of a day and night. As the earth rotates, every part of the earth is exposed to the sun one by one. This in turn embarks the separation between day and night. The side facing the sun would experience day whereas the side which is away from the sun would experience night. Hence, we have a huge time difference between India and America. Apart from this rotation is also responsible for the tidal effects generated due to the moon's gravitational force.