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  2. Calendar date - Wikipedia

    en.wikipedia.org/wiki/Calendar_date

    A calendar date is a reference to a particular day, represented within a calendar system, enabling a specific day to be unambiguously identified. Simple math can be performed between dates; commonly, the number of days between two dates may be calculated, e.g., "25 March 2025" is ten days after "15 March 2025".

  3. Solstice - Wikipedia

    en.wikipedia.org/wiki/Solstice

    Thus the solstices always occur between June 20 and 22 and between December 20 and 23 [30] [31] in a four-year-long cycle with the 21st and 22nd being the most common dates, as can be seen in the schedule at the start of the article.

  4. Calendar year - Wikipedia

    en.wikipedia.org/wiki/Calendar_year

    Julian year (astronomy) – a time interval of exactly 365.25 Earth days; Julian year (calendar) – a year in the Julian calendar that is either 365 or 366 days, or 365.25 days on average; Leap year – Calendar year containing an additional day; Model year – Production date of a commercial product

  5. Knuckle mnemonic - Wikipedia

    en.wikipedia.org/wiki/Knuckle_mnemonic

    Knuckles are counted as 31 days, depressions between knuckles as 30 (or 28/29) days. One starts with the little finger knuckle as January, and one finger or depression at a time is counted towards the index finger knuckle (July), saying the months while doing so.

  6. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    During the period between 1582, when the first countries adopted the Gregorian calendar, and 1923, when the last European country adopted it, it was often necessary to indicate the date of some event in both the Julian calendar and in the Gregorian calendar, for example, "10/21 February 1750/51", where the dual year accounts for some countries ...

  7. Old Style and New Style dates - Wikipedia

    en.wikipedia.org/wiki/Old_Style_and_New_Style_dates

    The corresponding date in the Gregorian calendar is 9 February 1649, the date by which his contemporaries in some parts of continental Europe would have recorded his execution. The O.S./N.S. designation is particularly relevant for dates which fall between the start of the "historical year" (1 January) and the legal start date, where different.

  8. Ordinary Time - Wikipedia

    en.wikipedia.org/wiki/Ordinary_Time

    In a year where Ordinary Time has 33 weeks, the omitted week is the one between the weeks immediately surrounding Lent and Easter Time, which varies with the date of Easter. This is because the weeks always count forward from the first week at the beginning of Ordinary Time, and separately backwards from the thirty-fourth week at the end of ...

  9. Calendrical calculation - Wikipedia

    en.wikipedia.org/wiki/Calendrical_calculation

    The number of days between two dates, which is simply the difference in their Julian day numbers. The dates of moveable holidays, like Christian Easter (the calculation is known as Computus) followed up by Ascension Thursday and Pentecost or Advent Sundays, or the Jewish Passover, for a given year. Converting a date between different calendars.