Computus
Meeus Julian algorithm
Columns: Expression | Y = 2008 | Y = 2009 | Y = 2010 | Y = 2011
a = Y mod 4 | a = 0 | a = 1 | a = 2 | a = 3 | b = Y mod 7 | b = 6 | b = 0 | b = 1 | b = 2 | c = Y mod 19 | c = 13 | c = 14 | c = 15 | c = 16 | d = (19c + 15) mod 30 | d = 22 | d = 11 | d = 0 | d = 19 | e = (2a + 4b − d + 34) mod 7 | e = 1 | e = 4 | e = 0 | e = 1 | month = floor ((d + e + 114) / 31) | 4 (April) | 4 (April) | 3 (March) | 4 (April) | day = ((d + e + 114) mod 31) + 1 | 14 | 6 | 22 | 11 | Easter Day (Julian calendar) | 14 April 2008 | 6 April 2009 | 22 March 2010 | 11 April 2011