OFFSET
2001,1
COMMENTS
Formulas may differ legitimately for years before 1583 (e.g., 1497).
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
EXAMPLE
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.
PROG
(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
CROSSREFS
KEYWORD
nonn,easy
AUTHOR
Frank Ellermann, May 10 2001
STATUS
approved