Culture and menstruation the ideal of synchronised tidal, lunar, menstrual and seasonal periodicities whose overall harmony (it is believed) confers spiritual power and fertility. To many, such cultural associations appear persuasive in view of the fact that in humans, the menstrual cycle quite closely approximates the moon's 29.5-day synodic cycle, unlike in chimpanzees (~36 days) or bonobos (~40 days). Statistical information from hunter gatherers is lacking, but where large-scale western studies focus on women's peak reproductive years—removing outlier values—the cycle length gravitates around 29.1–29.5 days, while the figure for women in their thirties shortens toward 28 days. In no extant human population has
Hitting for the cycle to hit for the cycle in two days. Conversely, the longest period of time between two players hitting for the cycle was 5 years, 11 months, and 30 days, a drought lasting from Michihiro Ogasawara cycle in 2008 to Rainel Rosario in 2014. The natural cycle has been accomplished five times in NPB history. Fumio Fujimura's second cycle on May 25, 1950, was the first time a player collected the hits in order. On average, the natural cycle occurs approximately every 13 years. Other than Fujimura, the four players to hit for the natural cycle are Kazuhiko Kondo in 1961,