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From Wikipedia, the free encyclopedia. Diurnal motion (Latin diurnus â²dailyâ², from dies â²dayâ²) is an astronomical term referring to the apparent daily motion of stars around the Earth, or more precisely around the two celestial poles.
Perpetual motion is the concept of getting useful work from something forever without an infinite energy source. There are two types of perpetual motion machines. The first type is one that creates energy from nothing somehow to do work, which breaks the first law of thermodynamics, which states that energy can in no way be created or destroyed.