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The Calendar in Perspective
Basic Calendar Concepts
Basic Calendar Patterns
3 other sections not shown
12 lunations 12 months 29 days 30 days adopted agricultural ancient approximately April astronomer Babylonian basic calen Calendar Reform century Christmas CM CM CM CM cn Comte cycle day of rest December Easter Egyptian Egyptian Calendar embolismic endar equal-quarter extra day factor February February 28 four Friday full moon Gregorian Calendar half-years Hebrew holidays industrial instrument integral number intercalary intercalation International Fixed Calendar January Julian Calendar Julius Caesar July June Labor Day lunar calendar lunar month luni-solar calendar March 21 measure Monday month to month months of 30 namely needs November number of days number of weeks observed occur period practice reckoning religious Roman Saturday seasons Sept September seven days sidereal month social solar calendar solstice split week stabilizing day standard statistics Sunday synchronize synodic month Table Thanksgiving Thirteen-Month Calendar Thursday tion tropical Tuesday United vernal equinox Wednesday weekdays World Calendar York