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Diurnal ("daily") may refer to:
- Diurnal cycle, any pattern that recurs daily
- Diurnality, the behavior of animals and plants that are active in the daytime
- Diurnal motion, the apparent motion of stars around the Earth
- Diurnal phase shift, a phase shift of electromagnetic signals
- Diurnal temperature variation, a cycle of daily temperature change
- 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
- Diurnal arc, time expressed as right ascension
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