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Zeitgeber (from German for "time giver") is any external (exogenous) cue that entrains the internal (endogenous) time keeping system of organisms. It is any feature of the external environment that provides clues as to the passage of time, for example the passage of the sun, moon and stars.

The strongest Zeitgeber, for animals, is light. Other, non-photic, zeitgebers include changes in:

See alsoEdit

References Edit

Further readingEdit

  • Aschoff J (1965) The phase-angle difference in circadian periodicity.In "Circadian Clocks" (J. Aschoff, ed.). North Holland Press, Amsterdam, p 262–278.

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