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{{wiktionary|diurnal}}
'''Diurnal''' ("[[day|daily]]") may refer to:

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==General==
* [[Diurnal cycle]], any pattern that recurs daily
** [[Diurnality]], the behavior of animals and plants that are active in the daytime
* [[Diurnal phase shift]], a phase shift of electromagnetic signals
* [[Diurnal temperature variation]], a cycle of daily temperature change

==Astronomy==
* [[Diurnal arc]], the time (expressed in right ascension) that it takes a planet etc. to move from its rising to its setting point
* [[Diurnal motion]], the apparent motion of stars around the Earth

==Astrology==
* Diurnal chart, a chart for a given date, based on the [[natal chart]]
* Diurnal planet, a planet in a [[astrology of sect|sect]] for which the Sun is above the horizon

==See also==
*[[Salisbury Diurnal]]

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