HI guys, Your responses to the post "round and round she goes" has prompted me to post this new thread. The folllowing is a theory in development thingo but I think very appropriate to the other post. I am sure that if it is more appropriate to post it in the physics theory dev, section that admin will shift it any way. I am going too post it there as well any way if I'm allowed. But in the interests of general discussion on the nature of rotational energies and Celestial mechanics here it is. Your criticisms and counter logic would be welcome. Gravitational differential. The earth and the sun share an attraction called gravity. The earth is always in the sun light therefore as the planet spins it is always heating up and cooling down. Sunrise and sunset happening continuously. The temperature differential being say approximately 20 degrees C.... We know that as mass cools it increases it’s density. We infer that an increase in density also increases the mass’s gravitational attraction. So therefore on this continuous sunrise (horizon) is a gravitational differential which means that the sunrise ( cooler – more dense) is more attractive than the sunset (Hotter) This differential imparts a torsional effort on the planet thus generating it’s rotational state. The above may, in part, explain the rotational effect on matter.