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diurnal circle
2 reference results for: Diurnal
Columbia Encyclopedia
diurnal circle, apparent path followed by a star due to the earth's rotation on its axis. The stars appear to move on the celestial sphere in concentric circular paths centered at the celestial poles. Since the earth rotates west to east, the stars appear to move from east to west along their diurnal circles. Stars whose diurnal circles lie completely above the horizon are called circumpolar stars.
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Wikipedia
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
  • 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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Last updated on Saturday June 14, 2008 at 15:21:49 PDT (GMT -0700)
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