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There is nothing so commonplace as a day, or so extraordinary, for the period of time that we customarily divide into 24 hours depends upon the amount of time required for our particular planet to spin one full turn upon its axis. Move to the moon, Mars, or Jupiter, and the day takes on quite different dimensions (if by a “day” we mean one complete cycle of light and darkness). If the earth rotated slower, the day would be longer; if it did not rotate at all, we would either be bathed in perpetual sunlight, or immersed in constant darkness. Needless to say, if absolute time exists, it has nothing to do with day length!
KeywordsDaily Rhythm Constant Darkness Pineal Organ Generic Oscillator Circannual Rhythm
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- Boulos, Z., and M. Terman. “Food availability and biological rhythms.” Neurosci. Biobehav. Rev. 4 (1980): 119–131.Google Scholar
- Fernstrom, J., R.J. Wurtman, B. Hammarstrom-Wiklund, W.M. Rand, H.N. Munro, and C.S. Davidson. “Diurnal variations in plasma concentrations of tryptophan, tyrosine, and other neutral amino acids; effect of dietary protein intake.” Am. T. Clin. Nutr. 32 (1979): 1912–1922.Google Scholar
- Glass, L., and M.C. Mackey. The Rhythms of Life. From Clocks to Chaos. Princeton, N.J.: Princeton University Press, 1988.Google Scholar
- Van der Pol, B. “The nonlinear theory of electric oscillations.” Proc I.RE. 22 (1934) 1054–1086.Google Scholar
- Wever, R.A. “A mathematical model of circadian rhythms.” In: Circadian Clocks. J. Aschoff, ed., Amsterdam: North Holland, 1965, 47–63.Google Scholar
- Wever, R.A. “Toward a mathematical model of circadian rhythmicity.” In: Moore-Ede, M.C., and C.A. Czeisler, Eds., Mathematical Models of the Circadian Sleep-Wake Cycle. New York: Raven Press, 1984, 17–79.Google Scholar