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This is a list of calendars.Included are historical calendars as well as proposed ones. Historical calendars are often grouped into larger categories by cultural sphere or historical period; thus O'Neil (1976) distinguishes the groupings Egyptian calendars (Ancient Egypt), Babylonian calendars (Ancient Mesopotamia), Indian calendars (Hindu and Buddhist traditions of the Indian subcontinent ...
A 50-year "pocket calendar" that is adjusted by turning the dial to place the name of the month under the current year. One can then deduce the day of the week or the date. A perpetual calendar is a calendar valid for many years, usually designed to look up the day of the week for a given date in the past or future.
"It is worth a library of books on the subject of history" (G. McCloskie, L.L.D. Professor of Natural History at Princeton College) "Indicates at a glance the date, progress, and synchronism of historical events, as clearly as could be learned in days and weeks in ordinary historical works" (A.D. Hager, Secretary, Chicago Historical Society)
The history of calendars covers practices with ancient roots as people created and used various methods to keep track of days and larger divisions of time. Calendars commonly serve both cultural and practical purposes and are often connected to astronomy and agriculture.
[[Category:Time, date and calendar templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Time, date and calendar templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
[[Category:Time, date and calendar list templates]] to the <includeonly> section at the bottom of that page. Otherwise, add <noinclude>[[Category:Time, date and calendar list templates]]</noinclude> to the end of the template code, making sure it starts on the same line as the code's last character.
No guidance is provided about conversion of dates before March 5, -500, or after February 29, 2100 (both being Julian dates). For unlisted dates, find the date in the table closest to, but earlier than, the date to be converted. Be sure to use the correct column. If converting from Julian to Gregorian, add the number from the "Difference" column.