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Kant, following Newtonian principles, considers what external causes could effect any changes in the rotation of the earth. In his essay, he explains the problem posed by the Prussian Royal Academy of Sciences in their prize essay question. These include whether the axial rotation of the Earth which brings about the alternation of day and night has undergone any change since its origin, what the cause may be, and how one can be certain of it. He says that the Earth turns continually on its axis with a free motion which would thenceforth continue unchanged and at the same speed and direction ad infinitum, if there were no obstacles or external causes to retard or accelerate it. He tries to show that an external cause really is present, and it gradually reduces the Earth's motion and even conspires over immeasurably long periods to stop its rotation altogether.
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