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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.
Diurnal pressure variation. Measurements of surface pressure reveal a both a diurnal and a semidiurnal (12h) rhythm underlying any longer-term (synoptic) variation (1). This rhythm is the surface image of a diurnal tide of the entire atmosphere. A wave moves across the upper atmosphere, westward with the speed of the Sun.