Authors: Nainan K. Varghese
Abstract: A part of action by ‘central force’ between planetary and central bodies causes their spin motions. All macro bodies in planetary systems develop mean accelerating spin motion. Depending on their orbital parameters, planets and central bodies may spin forward, rearward or, in rare cases, may have no spin motion at all. All macro bodies in a planetary system tend to spin in common orbital plane. Angular accelerations of orbiting macro bodies continue indefinitely until centrifugal actions disintegrate planets and planetary system. In an orbiting macro body, consistency of its matter-content and radial size determines relative spin speeds at different parts. Equatorial region of all very large orbiting macro bodies spin faster than their polar regions or regions towards their spin-axes. Lengthening of (terrestrial) solar days, presently misinterpreted as slowing down of earth’s spin motion, is the result of insufficient compensation to earth’s apparent spin motion about sun.
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