Diurnal ("day") may refer to:
General
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Diurnal cycle, any pattern that recurs daily
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Diurnality, the behavior of animals and plants that are active in the daytime
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Diurnal phase shift, a phase shift of electromagnetic signals
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Diurnal temperature variation, a cycle of daily temperature change
Astronomy
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Diurnal arc, the time (expressed in right ascension) that it takes a planet etc. to move from its rising to its setting point
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Diurnal motion, the apparent motion of stars around the Earth
Astrology
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Diurnal chart, a chart for a given date, based on the natal chart
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Diurnal planet, a planet in a sect for which the Sun is above the horizon
See also
