Easter is one of the most important Christian religious festivities. On Easter day, millions of Christians all around the world celebrate the Resurrection of Jesus Christ. However, it is not easy at all to calculate the Easter Day. Easter is celebrated on the first Sunday after the first full moon that happens after the vernal equinox. As these conditions vary a lot, it can happen from March 22 to April 25. But, this event seldom happens on the ends of this interval of time.

In Latin, the calculation of the Easter Date is known as *computus*. There are several mathematical algorithms all of which are too complex to calculate the day and the month when Easter takes place. As an example, for all of these who want to try here it is the **Meeus/Jones/Butcher** algorithm:

- a = MOD(ANO;19)
- b = ANO \ 100
- c = MOD(ANO;100)
- d = b \ 4
- e = MOD(b;4)
- f = (b + 8) \ 25
- g = (b - f + 1) \ 3
- h = MOD((19 × a + b - d - g + 15);30)
- i = c \ 4
- k = MOD(c;4)
- L = MOD((32 + 2 × e + 2 × i - h - k);7)
- m = (a + 11 × h + 22 × L) \ 451
- MÊS = (h + L - 7 × m + 114) \ 31
- DIA = MOD((h + L - 7 × m + 114);31) + 1

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