メトン周期簡易計算

19年ごとに月齢が同じになるという法則。メトン周期を単純計算します(Metonic cycle)
AD年(YY) 月(MM) 日(DD)
-57 1912/10/1(TUE) MOONAGE19.2(Gemini 2')
-38 1931/10/1(THU) MOONAGE18.6(Taurus23')
-19 1950/10/1(SUN) MOONAGE19.2(Gemini 2')
Start Date 1969/10/1(WED) MOONAGE20(Gemini11')
+19 1988/10/1(SAT) MOONAGE20.6(Gemini19')
+38 2007/10/1(MON) MOONAGE19.6(Gemini 7')
-57 2026/10/1(THU) MOONAGE19.5(Gemini 5')

メトン周期簡易計算ver1.0
since Sep4.2020
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