diamond geezer

 Saturday, April 15, 2006

Isn't Easter late this year? Well no, actually it isn't. Easter falls in the second half of April about 25% of the time, so Easter 2006 is quite normal. It fell as late as April 20th three years ago, and on April 23rd in 2000. If you want a really late Easter you need to wait just five years, because Easter 2011 falls on April 24th (which is stunningly rarely late). It can even fall as late as April 25th, but that only happens about once a century (and if you weren't around in 1943, you'll have to hang on until 2038 to experience it).

Easter Day always falls "on the first Sunday after the first full moon after the spring equinox". This year the spring equinox was way back on March 20th but the first full moon wasn't until last Wednesday, and that makes Easter Day tomorrow. Simple (ish). Except that the church doesn't use the real spring equinox, it uses the date of the spring equinox in 325AD. And the church doesn't use the real full moon, it uses an approximate one called the Paschal Full Moon, with dates that repeat every 19 years. If (and only if) this Paschal Full Moon falls on Sunday April 18th, then Easter Day can be as late as Sunday April 25th. I'll leave the full explanation to others (here), but the upshot is that Easter Day can fall on any date from March 22nd to April 25th inclusive.

Here's how the date of Easter pans out over a full 5.7 million year cycle:

22 Mar - 26 Mar	27 Mar - 31 Mar	1 Apr - 5 Apr	6 Apr - 10 Apr	11 Apr - 15 Apr	16 Apr - 20 Apr	21 Apr - 25 Apr
7%	16%	17%	17%	17%	17%	9%

10 fantastically geeky Easter date links: • • • • • • • • • •

posted 00:30 :

<< click for Newer posts

click for Older Posts >>

click to return to the main page

...or read more in my monthly archives
Jan24  Feb24  Mar24  Apr24  May24  Jun24  Jul24  Aug24  Sep24  Oct24  Nov24
Jan23  Feb23  Mar23  Apr23  May23  Jun23  Jul23  Aug23  Sep23  Oct23  Nov23  Dec23
Jan22  Feb22  Mar22  Apr22  May22  Jun22  Jul22  Aug22  Sep22  Oct22  Nov22  Dec22
Jan21  Feb21  Mar21  Apr21  May21  Jun21  Jul21  Aug21  Sep21  Oct21  Nov21  Dec21
Jan20  Feb20  Mar20  Apr20  May20  Jun20  Jul20  Aug20  Sep20  Oct20  Nov20  Dec20
Jan19  Feb19  Mar19  Apr19  May19  Jun19  Jul19  Aug19  Sep19  Oct19  Nov19  Dec19
Jan18  Feb18  Mar18  Apr18  May18  Jun18  Jul18  Aug18  Sep18  Oct18  Nov18  Dec18
Jan17  Feb17  Mar17  Apr17  May17  Jun17  Jul17  Aug17  Sep17  Oct17  Nov17  Dec17
Jan16  Feb16  Mar16  Apr16  May16  Jun16  Jul16  Aug16  Sep16  Oct16  Nov16  Dec16
Jan15  Feb15  Mar15  Apr15  May15  Jun15  Jul15  Aug15  Sep15  Oct15  Nov15  Dec15
Jan14  Feb14  Mar14  Apr14  May14  Jun14  Jul14  Aug14  Sep14  Oct14  Nov14  Dec14
Jan13  Feb13  Mar13  Apr13  May13  Jun13  Jul13  Aug13  Sep13  Oct13  Nov13  Dec13
Jan12  Feb12  Mar12  Apr12  May12  Jun12  Jul12  Aug12  Sep12  Oct12  Nov12  Dec12
Jan11  Feb11  Mar11  Apr11  May11  Jun11  Jul11  Aug11  Sep11  Oct11  Nov11  Dec11
Jan10  Feb10  Mar10  Apr10  May10  Jun10  Jul10  Aug10  Sep10  Oct10  Nov10  Dec10 
Jan09  Feb09  Mar09  Apr09  May09  Jun09  Jul09  Aug09  Sep09  Oct09  Nov09  Dec09
Jan08  Feb08  Mar08  Apr08  May08  Jun08  Jul08  Aug08  Sep08  Oct08  Nov08  Dec08
Jan07  Feb07  Mar07  Apr07  May07  Jun07  Jul07  Aug07  Sep07  Oct07  Nov07  Dec07
Jan06  Feb06  Mar06  Apr06  May06  Jun06  Jul06  Aug06  Sep06  Oct06  Nov06  Dec06
Jan05  Feb05  Mar05  Apr05  May05  Jun05  Jul05  Aug05  Sep05  Oct05  Nov05  Dec05
Jan04  Feb04  Mar04  Apr04  May04  Jun04  Jul04  Aug04  Sep04  Oct04  Nov04  Dec04
Jan03  Feb03  Mar03  Apr03  May03  Jun03  Jul03  Aug03  Sep03  Oct03  Nov03  Dec03
 Jan02  Feb02  Mar02  Apr02  May02  Jun02  Jul02 Aug02  Sep02  Oct02  Nov02  Dec02