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

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
  • Diurnal arc, time expressed as right ascension

Famous quotes containing the word diurnal:

    No motion has she now, no force;
    She neither hears nor sees;
    Rolled round in earth’s diurnal course,
    With rocks, and stones, and trees.
    William Wordsworth (1770–1850)