| Ash Wednesday: | |
| Easter: | |
| Ascension: | |
| Pentecost: | |
| Advent Sunday: |
The following is an algorithm by which the date of Easter may be calculated in the Western churches. There are lots of ways of doing this, and there is a choice between using lookup tables and arithmetic! The following method is used on this website, since it needs no lookup tables.
| Divide | by | Quotient | Remainder |
|---|---|---|---|
| the year x | 19 | - | a |
| the year x | 100 | b | c |
| b | 4 | d | e |
| b + 8 | 25 | f | - |
| b - f + 1 | 3 | g | - |
| 19*a + b - d - g + 15 | 30 | - | h |
| c | 4 | i | k |
| 32 + 2*e + 2*i - h - k | 7 | - | L |
| a + 11*h + 22*L | 451 | m | - |
| h + L - 7*m + 114 | 31 | n | p |
Then n is the number of the month (3 = March; 4 = April) and p + 1 is the day of that month upon which Easter Sunday falls. The symbol * means the product of the two numbers.
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