Chronopedia

cycle

  • Recurrence of (an) event(s), without necessarily being of a periodic nature (in contrast to "rhythm").

daily

  • (cycle) Event(s) occurring on a 24 h basis. Used synonymously with ìdielî and ìnycthemeralî.

delaying

  • (phase shift) Lengthening of the period for one to a few cycles (sign -).

diel

  • See daily.

diurnal

  • Events occurring in the day between dawn and dusk.

endogenous

  • (rhythm) An oscillating system capable of self sustained oscillations.

entrainment

  • Coupling of an endogenous rhythm to a Zeitgeber with the result that both oscillations have the same frequency. Possible only within limited ranges of frequencies. In entrainment, by coupling the phase of the endogenous rhythm is affected, in contrast to ìmaskingî.

exogenous

  • (rhythm) An oscillating system not capable of self sustained oscillations, but passively driven by external factors.

freerun

  • Frequency manifestation of self sustained oscillations, with a periodicity deviating from (eventual) Zeitgeber(s).

hourglass

  • Timing mechanism, in which the parameter studied is part of the causal loop (in contrast to ìclockî).

infradian

  • (rhythm) Non circa-rhythm with a period longer than 24 hours.

light-dark

  • (cycle) Alternation of a light-time and dark time (preferred notation LD aa:bb, L cc-dd; aa, bb in h; cc, dd, in clock time: for instance LD 16:8, L 07-23 h). In contrast to constant light (LL) and constant darkness (DD).

lunar

  • (Cycle): Event(s) occurring either at a time basis of 29.53 days (synodic month, based on moon-phases resulting from orbital positions of moon, sun and earth) or at a time basis of 27.32 days (the sidereal moon cycle around earth, relative to distant stars).

masking

  • (effect) Overruling by external factors of the expression of endogenous rhythm only temporarily, without affecting the phase of that rhythm (in contrast to ìentrainmentî).

nocturnal

  • Event(s) occurring in the night between dusk and dawn.

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