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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.
Basic Description. A simple harmonic motion, also called harmonic vibration or harmonic oscillation, is a type of periodic motion in physics where the restoring force on an object is directly proportional to the object's displacement from a certain point. The following 3 animations show some examples of harmonic vibrations: