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  2. Julian calendar - Wikipedia

    en.wikipedia.org/wiki/Julian_calendar

    In other words, the Julian calendar gains 3.1 days every 400 years. Gregory's calendar reform modified the Julian rule, to reduce the average length of the calendar year from 365.25 days to 365.2425 days and thus corrected the Julian calendar's drift against the solar year: the Gregorian calendar gains just 0.1 day over 400 years. For any given ...

  3. Roman calendar - Wikipedia

    en.wikipedia.org/wiki/Roman_calendar

    The original Roman calendar is usually believed to have been an observational lunar calendar [2] whose months ended and began from the new moon. [3] [4] Because a lunar cycle is about 29.5 days long, such months would have varied between 29 and 30 days. [5]

  4. Saint Nicholas Day - Wikipedia

    en.wikipedia.org/wiki/Saint_Nicholas_Day

    Saint Nicholas Day, also called the Feast of Saint Nicholas, observed on 6 December (and/or its eve on 5 December) in Western Christian countries, and on 19 December in Eastern Christian countries using the old church Calendar, is the feast day of Saint Nicholas of Myra; it falls within the season of Advent. [3]

  5. Gregorian calendar - Wikipedia

    en.wikipedia.org/wiki/Gregorian_calendar

    A calendar date is fully specified by the year ... to 18 February 1700 10 days From 1 March 1700 ... December (31 days), ...

  6. History of calendars - Wikipedia

    en.wikipedia.org/wiki/History_of_calendars

    The ancient Athenian calendar was a lunisolar calendar with 354-day years, consisting of twelve months of alternating length of 29 or 30 days. To keep the calendar in line with the solar year of 365.242189 days, an extra, intercalary month was added in the years: 3, 6, 8, 11, 14, 17, 19 of the 19-years Metonic cycle.

  7. Calendar of saints (Church of England) - Wikipedia

    en.wikipedia.org/wiki/Calendar_of_saints_(Church...

    In this way the calendar of the Church of England has importance beyond the immediate purpose of supporting the liturgy of the English Church. It is, for example, one of the key sources of the calendar for the international daily office Oremus. [2] Holy Days are variously categorised as Principal Feasts, Festivals, Lesser Festivals, or ...

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