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  2. Conversion between Julian and Gregorian calendars - Wikipedia

    en.wikipedia.org/wiki/Conversion_between_Julian...

    Within these tables, January 1 is always the first day of the year. The Gregorian calendar did not exist before October 15, 1582. Gregorian dates before that are proleptic, that is, using the Gregorian rules to reckon backward from October 15, 1582. Years are given in astronomical year numbering.

  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. Chinese calendar correspondence table - Wikipedia

    en.wikipedia.org/wiki/Chinese_calendar...

    Relationship between the current Sexagenary cycle and Gregorian calendar. This Chinese calendar correspondence table shows the stem/branch year names, correspondences to the Western calendar, and other related information for the current, 79th Sexagenary cycle of the Chinese calendar based on the 2697 BC epoch or the 78th cycle if using the 2637 BC epoch.

  5. Lunar calendar - Wikipedia

    en.wikipedia.org/wiki/Lunar_calendar

    A lunisolar calendar was found at Warren Field in Scotland and has been dated to c. 8000 BC, during the Mesolithic period. [2] [3] Some scholars argue for lunar calendars still earlier—Rappenglück in the marks on a c. 17,000 year-old cave painting at Lascaux and Marshack in the marks on a c. 27,000 year-old bone baton—but their findings remain controversial.

  6. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    [6] [d] (Scotland had already made this aspect of the changes, on 1 January 1600.) [7] [8] The second (in effect [e]) adopted the Gregorian calendar in place of the Julian calendar. Thus "New Style" can refer to the start-of-year adjustment, to the adoption of the Gregorian calendar, or to the combination of the two. It was through their use in ...

  7. Ecclesiastical new moon - Wikipedia

    en.wikipedia.org/wiki/Ecclesiastical_new_moon

    If the ecclesiastical lunar calendar is accurate, the ecclesiastical new moon can be any day from the day of the astronomical new moon or dark moon to two days later (see table). The ecclesiastical calendar valid for the Julian and Gregorian calendar are described in detail by Grotefend, [1] Ginzel [2] and in the Explanatory Supplement to The ...

  8. List of calendars - Wikipedia

    en.wikipedia.org/wiki/List_of_calendars

    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 ...

  9. Epact - Wikipedia

    en.wikipedia.org/wiki/Epact

    A solar calendar year has 365 days (366 days in leap years).A lunar calendar year has 12 lunar months which alternate between 30 and 29 days for a total of 354 days (in leap years, one of the lunar months has a day added; since a lunar year lasts a little over ⁠354 + 1 / 3 ⁠ days, a leap year arises every second or third year rather than every fourth.)