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  2. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The months of these calendars begin on the day with the new moon, with 12 or 13 months (lunations) in a year. The intercalary month is placed at the end of the year. In Qin China, the Qin calendar (simplified Chinese: 秦历; traditional Chinese: 秦曆) was introduced. It follows the rules of Zhuanxu's calendar, but the months order follows ...

  3. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    The Gregorian calendar, like the Julian calendar, is a solar calendar with 12 months of 28–31 days each. The year in both calendars consists of 365 days, with a leap day being added to February in the leap years. The months and length of months in the Gregorian calendar are the same as for the Julian calendar.

  4. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    365-day calendar used for accounting. Unix time, number of seconds elapsed since 1 January 1970, 00:00:00 (UTC). Julian day, number of days elapsed since 1 January 4713 BC, 12:00:00 (UTC). Heliocentric Julian Date, Julian day corrected for differences in the Earth's position with respect to the Sun.

  5. International Fixed Calendar - Wikipedia

    en.wikipedia.org/wiki/International_Fixed_Calendar

    The International Fixed Calendar (also known as the Cotsworth plan, the Cotsworth calendar, the Eastman plan or the Yearal[ 1] was a proposed calendar reform designed by Moses B. Cotsworth, first presented in 1902. [ 2] The International Fixed Calendar divides the year into 13 months of 28-days each.

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The issue spans the changeover; the date heading reads: "From Tuesday September 1, O.S. to Saturday September 16, N.S. 1752". [ 1] Old Style ( O.S.) and New Style ( N.S.) indicate dating systems before and after a calendar change, respectively. Usually, they refer to the change from the Julian calendar to the Gregorian calendar as enacted in ...

  7. Calendar - Wikipedia

    en.wikipedia.org/wiki/Calendar

    A calendar is a system of organizing days. This is done by giving names to periods of time, typically days, weeks, months and years. [ 1][ 2][ 3] A date is the designation of a single and specific day within such a system. A calendar is also a physical record (often paper) of such a system.

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