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7 h 46 m, 1 jan 1923 ano - 1923-1928 (Ogino) 1929(Knaus)-Discovered relationship of ovulation within menstrual cycle separate from each other -developed calendar formulas by determining that ovulation takes place during a fixed time period

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ByN. Husk
12 nov 2017
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7 h 46 m, 1 jan 1923 ano
Agora
~ 102 years ago
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