Calculating Easter

In today's cast, I discuss calculating Easter in the Western World (Gregorian Calendar), the history, and the pattern. If you are feeling particularly "mathy" you can use this formulae...

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The Penrose formulae for Calculating Easter:

Calculate D="'225'" - 11(Y MOD 19).

If D is greater than 50 then subtract multiples of 30 until the resulting new value of D is

less than 51.

If D is greater than 48 subtract 1 from it.

Calculate E="'(Y" +' [Y/4] + D + 1) MOD 7. (NB Integer part of [Y/4])

Calculate Q="'D +'" 7 - E.

If Q is less than 32 then Easter is in March. If Q is greater than 31 then Q - 31 is its date in April.

For example, for 1998:

D = 225 - 11*(1998 MOD 19) = 225 - 11*3 = 192

D is greater than 50, therefore:

D = (192 - 5*30) = 42

E = (1998 + [1998/4] + 42 + 1) MOD 7="'2540'" MOD 7="'6'"

Q = 42 + 7 - 6="'43'"

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or this...

2024 Easter Sunday Mar 31 2025 Easter Sunday Apr 20 2026 Easter Sunday Apr 5 2027 Easter Sunday Mar 28 2028 Easter Sunday Apr 16 2029 Easter Sunday Apr 1 2030 Easter Sunday Apr 21 2031 Easter Sunday Apr 13 2032 Easter Sunday Mar 28 2033 Easter Sunday Apr 17 2034 Easter Sunday Apr 9

 

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Reach out via email: john@biblicaltrumpets.org