circaannual - about once a year, circatidal - about every 12.5 hours, circalunar - about once a month, circadian - about once a day, nocturnal - active at night, diurnal - active in the day, crepuscular - active at dawn and dusk, zeitgeber - external/environmental cue that resets clock, exogenous - external/environmental, endogenous - internal, biological clock - internal mechanism for control rhythms, entrainment - the resetting of a biological clock by a zeitgeber, free running period - natural length of rhythm in the absence of environmental cues,

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