Leap year - Uruudoshi
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A leap year is a year that occurs once every four years and was created to adjust the discrepancy between the calendar and the movements of the Earth and Moon. The Earth orbits the Sun in exactly 365.2422 days, so every four years (four revolutions) results in an extra day of revolution time. To correct this error, leap years were introduced to make adjustments. Source : Academy of Divination School About the Divination Glossary |
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暦と、地球・月の運行の「ズレ」を調整するために作られた、４年に一度周期で訪れる年のこと。地球は、正確には365.2422日で太陽の周りを公転しているため、4年（4回公転）でおよそ1日分の公転時間が余分になってしまう。その誤差を修正するため、閏年を設けて調整することとなった。
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>>: Intercalary month - Uruzuki (English spelling)
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