MOBILE

, Primum, in the Ancient Astronomy, was a 9th heaven, or sphere, conceived above those of the planets and sixed stars. It was supposed that this was the first mover, and carried all the lower spheres about with it; by its rapidity communicating to them a motion carrying them round in 24 hours. But the diurnal apparent revolution of the heavens is now better accounted for, by the rotation of the earth on its axis, without the assistance of any such Primum Mobile.

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Entry taken from A Mathematical and Philosophical Dictionary, by Charles Hutton, 1796.

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