Holidays related to Easter: Difference between revisions
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From the year 325 CE on, [[wp:Easter Sunday|Easter Sunday]] has been defined as the first Sunday ''after'' the first full moon ''on or after'' the day of the March equinox. However, the actual astronomical values for the moments of the full moon and equinox are not used. Instead, approximations are used, the first one being that the equinox is assumed to fall on March 21st every year. The tracking of the moon phases is similarly done with relatively straightforward arithmetic (compared to the sort required for astronomical accuracy) which amounts to maintaining a lunisolar calendar in parallel to our standard purely-solar one.
When Pope Gregory reformed the Catholic calendar in 1582 CE, the drifting of Easter with respect to the seasons was the driving motivation, and the rules for determining it (called the
You may find algorithms on the [[wp:Computus|Computus]] Wikipedia page. Some of the results:
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