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3r Earliest Time
The Julian Calendar
The Gregorian Calendar
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12 months 13-month calendar 13-month plan 91 days adopted American annual approval April arrangement Association Astronomical became better calendar birthday Calen Calendar Reform calendar revision celebrated century Christian Church civil calendar clock Committee Congress Cotsworth countries days and dates December 25 Dionysius Exiguus Earth Earth's breath Easter date Eastern Orthodox Egyptians endar equal quarters equal-quarter extra Saturday World February February 11 festivals fixed Easter Friday full moon Government Gregorian calendar Gregorian reform groups half-year intercalation January Journal of Calendar Julian calendar Julius Caesar July June Labor League of Nations Leap-Year Day March March 21 ment Monday month-dates moon calendar November observed October past perpetual calendar pontiffs present calendar Prid quarter-year regular Roman calendar scientific accuracy seasons September seven-day week Sextilis Sirius social spring equinox stability sun calendar time-plan time-units tion United weekdays wherein World Calendar World Holi World Holidays Year-End Day Year's Day