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Chronology relating to Time Measurement
12 lunations 1st January 30 days accurate adopted ancient Armenian astronomical Babylon Babylonian beginning calculation calendar reform calendar system called celebration celestial century B.C. Chaldeans China Chinese Christian chronology civil clepsydra clock commencement constellations count day doin daylight divided dominical letters early earth Easter eclipse Egypt Egyptian calendar emperor equal Ezen feast festival fixed free days full moon Greek Gregorian calendar Hebrews heliacal rising Hindu India indicated intercalary month intercalation intervals Julian calendar Jupiter known League of Nations leap length lunar calendar lunar month market week Maya mean solar measurement method Metonic Cycle midnight modern Mohammedan month names Nakshatras natural divisions night observed orbit origin period Persia planets Pleiades primitive proposed purposes quintal recorded religious Roman rule seasons seems seven-day week sexagenary cycle siderial signs solar calendar solar day Sothic cycle stars summer solstice Sunday sundial sunset tion tropical vernal equinox winter solstice Zodiac