A060958 Gregorian Easter dates, starting after 2000-04-23, a(2000) = 54.

46, 31, 51, 42, 27, 47, 39, 23, 43, 35, 55, 39, 31, 51, 36, 27, 47, 32, 52, 43, 35, 48, 40, 31, 51, 36, 28, 47, 32, 52, 44, 28, 48, 40, 25, 44, 36, 56, 41, 32, 52, 37, 29, 48, 40, 25, 45, 36, 49, 41, 33, 52, 37, 29, 49, 33, 53, 45, 30, 49, 41, 26, 46, 37, 29, 42

Offset: 2001

Author

Frank Ellermann, May 10 2001

Keywords

• nonn
• easy

Comments

Formulas may differ legitimately for years before 1583 (e.g., 1497).

Examples

			a(2001) = 46 = 31 + 15 => 2001-04-15, a(2002) = 31 => 2002-03-31.
a(y) + 49 gives Whitsunday, i.e., a(y) - 12 in May or a(y) - 43 in June.
		

Links

• Physikalisch-Technische Bundesanstalt, Gauss's formula
• L. Huber, Oudin's formula
• H. Lichtenberg, Zur Interpretation der Gauss-schen Osterformel und ihrer Ausnahmeregeln, Historia Mathematica 24 (1997), pp. 441-444.
• E. Weisstein, Easter
• Index entries for sequences related to calendars

Programs

Python

from dateutil.easter import *
def a(n): return (easter(n).month-3)*31 + easter(n).day
print([a(n) for n in range(2001, 2067)]) # Michael S. Branicky, Apr 04 2021