Diurnal

Diurnal ("daily") may refer to:

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 sect for which the Sun is above the horizon
 * Diurnal sign, a sign in the zodiac