As a moveable feast, the date of Easter is determined in each year through a calculation known as computus (Latin for 'computation'). Easter is celebrated on the first Sunday after the Paschal full moon, which is the first full moon on or after 21 March (a fixed approximation of the March equinox). Determining this date in advance requires a correlation between the lunar months and the solar year, while also accounting for the month, date, and weekday of the Julian or Gregorian calendar. The complexity of the algorithm arises because of the desire to associate the date of Easter with the date of the Jewish feast of Passover which, Christians believe, is when Jesus was crucified. It was originally feasible for the entire Christian Church to receive the date of Easter each year through an annual announcement by the Pope. By the early third century, however, communications in the Roman Empire had deteriorated to the point that the church put great value in a system that would allow the clergy to determine the date for themselves, independently yet consistently. Additionally, the church wished to eliminate dependencies on the Hebrew calendar, by deriving the date for Easter directly from the March equinox. In The Reckoning of Time (725), Bede uses computus as a general term for any sort of calculation, although he refers to the Easter cycles of Theophilus as a "Paschal computus." By the end of the 8th century, computus came to refer specifically to the calculation of time.The calculations produce different results depending on whether the Julian calendar or the Gregorian calendar is used. For this reason, the Catholic Church and Protestant churches (which follow the Gregorian calendar) celebrate Easter on a different date from that of the Eastern Orthodox Churches (which follow the Julian calendar). It was the drift of 21 March from the observed equinox that led to the Gregorian reform of the calendar, to bring them back into line. (Wikipedia).
Bet You Didn't Know: Easter Traditions | History
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Christianity's most important algorithm
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From playlist Algorithm Archive
Eggs Benedict Day (April 16) | This Day in History #3
April 16, 2013 is National Eggs Benedict Day, a day to celebrate the wonderful breakfast concotion. But where did eggs benedict originate? Theories differ. Plus, have the tables turned on Josh and Chuck in their ongoing spying effort? Have the hunters become the hunted? Tune in for new ep
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History of the Holidays: Easter | History
A quick look at the holiest day on the Christian calender, Easter. HISTORY®, now reaching more than 98 million homes, is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across al
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History of the Holidays: Easter | History
Learn more about the holiday of Easter and it's origins. HISTORY®, now reaching more than 98 million homes, is the leading destination for award-winning original series and specials that connect viewers with history in an informative, immersive, and entertaining manner across all platform
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The Mysterious Origins of Easter
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Gauss's Easter Algorithm Day 3
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Gauss's Easter Algorithm, Day 1
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Gauss's Easter Algorithm Day 6
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Gauss's Easter Algorithm Day 5
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Gauss's Easter Algorithm Day 13
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Gauss's Easter Algorithm Day 2
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Gauss's Easter Algorithm Day 4
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Gauss's Easter Algorithm Day 16 / Finale!
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Gauss's Easter Algorithm Day 7
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Bet You Didn't Know: Christmas | History
Did you know Christmas wasn't always celebrated on December 25th? Get the whole story behind the holiday. #HistoryChannel Subscribe for more HISTORY: http://histv.co/SubscribeHistoryYT Check out exclusive HISTORY content: Newsletter: https://www.history.com/newsletter Website - http://www
From playlist Holidays: Christmas | History