Although prior to the replacement of the Julian calendar in 1752 some printers of the Book of Common Prayer placed the saltus correctly, beginning the next month on 30 July, none of them continued the sequence correctly to the end of the year.

Re-vision Radio's Tower of Song. "The Many Easters & Eostres for the Many: A Choice of Hallelujahs". Archived from the original on 16 April 2021 . Retrieved 26 June 2021. Easter, one of the oldest Christian traditions, is the celebration of the last week of Jesus’ life, his death, and his resurrection. For Christians, Easter symbolises the dawn of a new life and the high point of the Christian calendar. In the solar calendar Easter is called a moveable feast since its date varies within a 35-day range. But in the lunar calendar, Easter is always the third Sunday in the paschal lunar month, and is no more "moveable" than any holiday that is fixed to a particular day of the week and week within a month, such as Thanksgiving. Shields, Miriam Nancy (1924). "The new calendar of the Eastern churches". Popular Astronomy. 32: 407–411. Bibcode: 1924PA.....32..407S.

Why did the Council of Nicaea need to intervene?

Doggett, L.E. (1992). Seidelmann, P.Kenneth (ed.). Explanatory Supplement to the Astronomical Almanac. Washington: U.S. Naval Observatory. p.582. ISBN 0-935702-68-7.

Richards, E. G. (2013). "Calendars". In S. E. Urban; P. K. Seidelmann (eds.). Explanatory Supplement to the Astronomical Almanac (3rded.). Mill Valley, CA: Univ Science Books. The present mapping, valid from 1900 to 2199, gives Easter dates with highly varying frequencies. March 22 can never occur, whereas March 31 occurs 13 times in this 300-year span. Dershowitz, Nachum; Reingold, Edward M. (2008). Calendrical Calculations. Cambridge University Press. ISBN 978-0-521-88540-9. Archived from the original on 9 April 2023 . Retrieved 14 December 2020. Thus the lunar month took the name of the Julian month in which it ended. The nineteen-year Metonic cycle assumes that 19 tropical years are as long as 235 synodic months. So after 19 years the lunations should fall the same way in the solar years, and the epacts should repeat. Over 19 years the epact increases by 19 × 11 = 209 ≡ 29 ( mod 30), not 0 (mod 30). That is, 209 divided by 30 leaves a remainder of 29 instead of being a multiple of 30. This is a problem if compensation is only done by adding months of 30 days. [e]

Fish is the traditional food of choice for Good Friday suppers, while some devout Christians opt to fast instead in memory of the sacrifice given by Jesus Christ. A modified 84-year cycle was adopted in Rome during the first half of the 4th century. Victorius of Aquitaine tried to adapt the Alexandrian method to Roman rules in 457 in the form of a 532-year table, but he introduced serious errors. [18] These Victorian tables were used in Gaul (now France) and Spain until they were displaced by Dionysian tables at the end of the 8thcentury. The date of Easter hops around each year – typically between March 22 and April 25. In short, the holiday falls on the first Sunday after the full Moon on or following the spring equinox.

In medieval western Europe, the dates of the paschal full moon (14 Nisan) given above could be memorized with the help of a 19-line alliterative poem in Latin: [63] [64] Nonae Aprilis So the first allowable date of Easter is March 22 + d + 0, as Easter is to celebrate the Sunday after the ecclesiastical full moon; that is, if the full moon falls on Sunday 21 March, Easter is to be celebrated 7 days after, while if the full moon falls on Saturday 21 March, Easter is the following 22 March. According to History.com, Easter eggs are also "said to represent Jesus’ emergence from the tomb and resurrection." A normal year has 365 days, but 52 × 7 = 364, so 52 full weeks make up one day too little. Hence, each consecutive year, the weekday "slides one day forward", meaning if 6 May was a Wednesday one year, it is a Thursday the following year (disregarding leap years). Both b and c increase by one for an advancement of one year (disregarding modulo effects). The expression 2 b + 4 c thus increases by 6 – but remember that this is the same as subtracting 1 mod 7. The lunar cycle of Anatolius, according to the tables in De ratione paschali, included only two bissextile (leap) years every 19years, so could not be used by anyone using the Julian calendar, which had four or five leap years per lunar cycle. [12] [13]Explanation of the Gregorian solar and lunar calendar, with improved procedures over the tabular method, by David Madore The First Council of Nicaea (325) did not, however, provide any explicit rules to determine that date, but only wrote "all our brethren in the East who formerly followed the custom of the Jews are henceforth to celebrate the said most sacred feast of Easter at the same time with the Romans and yourselves [the Church of Alexandria] and all those who have observed Easter from the beginning." [60] The medieval computus was based on the Alexandrian computus, which was developed by the Church of Alexandria during the first decade of the 4th century using the Alexandrian calendar. [61]