The "Gihō-reki" system was brought from Korea to Japan in "Yi-feng" era (676-678) of the reign of Emperor Gaozong of Tang. This calendar corrected errors in the "Yuan-jia li" (Genka calendar) which was developed in China. For a short time, both "Genka" and "Gihō" calendars were in use.= = = Oestrous cycle = = =
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