Leap year

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211	PDF Document Add to Reading List Source URL: www.hermetic.ch Language: English - Date: 2008-07-31 01:46:59 Astrology Astronomy Roman calendar Gregorian calendar Celestial coordinate system Calendar reform Tropical year Julian calendar Leap year Calendars Measurement Units of time
212	PDF Document Add to Reading List Source URL: www.math.nus.edu.sg Language: English - Date: 2000-12-26 00:25:22 Time Chinese calendar Month Lunisolar calendar Gregorian calendar Intercalation Leap year Solar calendar Zu Chongzhi Calendars Measurement Moon