Diurnal
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Diurnal ("daily") may refer to:
- Diurnality, the behavior of an animal that is active in the daytime
- Actions which are completed in 24 hours and are repeated every 24 hours, e.g. the sun reaching its zenith.
- Diurnal motion, the apparent motion of stars around the Earth, caused by the Earth's rotation around its axis. More generally it means repeating daily as in e.g. diurnal effect
- Diurnal phase shift, the phase shift of electromagnetic signals associated with daily changes in the ionosphere
- Diurnal temperature variation, the daily temperature shift that occurs from daytime to night
In astrology:
- Diurnal chart, a chart for a given date, based on the natal chart
- Diurnal planet, a planet in a sect for which the Sun is above the horizon
- Diurnal sign, a sign in the zodiac whose natural positions are on the southern hemisphere of the horoscope
In astronomy:
- Diurnal arc, the time, as expressed in right ascension, it takes a planet, point, or degree to move from its rising point to its setting point
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