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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. Learn about the different types, uses, and algorithms of perpetual calendars, and their relation to the Gregorian and Julian calendars.
Learn about the calendar changes in Europe and the British Empire from Julian to Gregorian system, and the start-of-year adjustments from 25 March to 1 January. Find out how to use O.S. and N.S. notation for historical dates and events.
Learn about the Celtic calendar, a compilation of pre-Christian Celtic systems of timekeeping, including the Gaulish Coligny calendar, used by Celtic countries to define the beginning and length of the day, the week, the month, the seasons, quarter days, and festivals. Compare the Celtic calendar with the astronomical and meteorological calendars, and see the native and borrowed terms in ...
Learn about the runic calendar, a perpetual calendar used in Northern Europe until the 19th century. It is based on the 19 year-long Metonic cycle and marks special days with runes or symbols.
Learn how to calculate the day of the week for any date using the Doomsday rule, a mental technique invented by John Conway. The rule uses doomsdays, such as 4/4, 6/6, and 8/8, to find the anchor day for the year and century.
The term perennial calendar appeared as early as 1824, in the title of Thomas Ignatius Maria Forster's Perennial calendar and companion to the almanack. [1] In that work he compiled "the events of every day in the year, as connected with history, chronology, botany, natural history, astronomy, popular customs and antiquities, with useful rules of health, observations on the weather ...
The Gregorian calendar is the calendar used in most parts of the world since 1582. It is a modification of the Julian calendar that corrects the drift of the equinoxes and adds a leap day every four years, except for centurial years divisible by 400.
Learn about the Maya calendar system, which consists of several cycles or counts of different lengths, such as the 260-day Tzolkin, the 365-day Haab, and the Long Count. The Long Count is a count of days since a mythological starting-point, equivalent to August 11, 3114 BC in the proleptic Gregorian calendar.
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