A biological rhythm may be defined as lunar periodicity if the maxima and minima of the rhythmical process appear once or twice in every lunar month at the same time, that is, at the time of a certain moon-phase, or, in other words, if they follow each other periodically in distances of about 30 (precisely 29.53) or 15 (precisely 14.77) days.
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C. Hauenschild (1960) studied this question.
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