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A Smooth and Subtle Thief
Ocean of Years
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13-month calendar 13-month plan 13th month adoption ancient astronomers became beginning calen calendar reform calendar revision century Christian Church civil calendar clock committee Constantine days 29 days days 30 days December difficulties earth Easter Egyptian endar equal quarters extra day favor February four governments Gregorian calendar Gregorian reform improved calendar India inserted intercalation January Jewish Julian calendar Julius Caesar June Kalends League of Nations leap leap-year Leapyear Day lunar calendar March Marco Mastrofini measuring ment Mercedonius Monday month 29 month 30 days moon Moslem observed October perpetual calendar Pope Gregory XIII present calendar primitive proposed reckoning regular Roman calendar Russian S M T W T F S S M T W T F S 12 Sabbath Saturday scientific seasons September seven-day week seventh day solar calendar stability Sunday thou tion twelve months United Nations universal wandering weekdays World Calendar Association world holidays Worldsday