text: what are the  effect of the motions of the earth as to rotation & revolution for having day and night?   revolution : the motion of a body around the circumference of a circle (or any object ) is called revolution. rotation: the motion of a body revolvoing about its own axis is called rotation.  earth revolves in an elliptical order around sun which makes revoloutin of the earth.the gravitational  force exerted by the sun on earth makes it to revolve earth (or any planet) around sun. it takes 365 days 6hrs to revolve around sun.due to revolution of the earth , we are having different seasons like summer, winter ,spring,rainy .  the cause of rotation of the earth is due to the evolution of the sun and planets. initially when planets were formed they were at higher temperature.at higher temperature, molecules(or the particles)  of the earth were moving randomly away from sun, which made them to rotate.due to rotation of the earth, we are having day and night..