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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.
For most of here on planet Earth, sunrise, sunset, and cycle of day and night (aka. the diurnal cycle) is just a simple fact of life. As a result of seasonal changes that happen with every passing year, the length of day and night can vary â and be either longer or shorter â by just a few hours. But in some regions of the world, this cycle is completely different.