The perpetual calendar
in [Math]
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From: Mike Barnes on 19 Feb 2010 11:25 John Atkinson <johnacko(a)bigpond.com>: >Halmyre wrote: >> >> I just wish they'd settle on a date for Easter and be done with it. >> >But, the whole point of Easter is that it has a full moon! A full-*ish* moon, actually. The definitions of the equinox and full moon used when determining Easter are rather different from the real definitions used by astronomers, which would actually give rise to different (perhaps several weeks different) Easter dates depending on one's longitude. But I thought that for most people the whole point of Easter is that they get time off work. -- Mike Barnes Cheshire, England
From: Evan Kirshenbaum on 19 Feb 2010 11:52 "Peter T. Daniels" <grammatim(a)verizon.net> writes: > On Feb 19, 4:34�am, James Hogg <Jas.H...(a)gOUTmail.com> wrote: >> My Book of Common Prayer makes things easy by pointing out that >> "the moon referred to in the definition of Easter Day is not the >> actual moon of the heavens, but the Calendar Moon, or Moon of the >> Lunar Cycle, which is counted as full on its fourteenth day, >> reckoned from the day of the Calendar New Moon inclusive." Also, in >> a Bissextile Year "the number of Sundays after Epiphany will be the >> same, as if Easter Day had fallen one day later than it really >> does." > > Which is why Easter and Passover rarely coincide -- we happen to have > had a spate of coincidence in recent years, but that'll soon be over. Which years were those? I had thought that the current Easter rules made it impossible for it to fall on the 15th of Nissan. -- Evan Kirshenbaum +------------------------------------ HP Laboratories |We never met anyone who believed in 1501 Page Mill Road, 1U, MS 1141 |fortune cookies. That's astounding. Palo Alto, CA 94304 |Belief in the precognitive powers |of an Asian pastry is really no kirshenbaum(a)hpl.hp.com |wackier than belief in ESP, (650)857-7572 |subluxation, or astrology, but you |just don't hear anyone preaching http://www.kirshenbaum.net/ |Scientific Cookie-ism. | Penn and Teller
From: LFS on 19 Feb 2010 12:02 Evan Kirshenbaum wrote: > "Peter T. Daniels" <grammatim(a)verizon.net> writes: > >> On Feb 19, 4:34 am, James Hogg <Jas.H...(a)gOUTmail.com> wrote: > >>> My Book of Common Prayer makes things easy by pointing out that >>> "the moon referred to in the definition of Easter Day is not the >>> actual moon of the heavens, but the Calendar Moon, or Moon of the >>> Lunar Cycle, which is counted as full on its fourteenth day, >>> reckoned from the day of the Calendar New Moon inclusive." Also, in >>> a Bissextile Year "the number of Sundays after Epiphany will be the >>> same, as if Easter Day had fallen one day later than it really >>> does." >> Which is why Easter and Passover rarely coincide -- we happen to have >> had a spate of coincidence in recent years, but that'll soon be over. > > Which years were those? I had thought that the current Easter rules > made it impossible for it to fall on the 15th of Nissan. > I understood that it is not actually impossible but that the coincidence is very rare. ISTR it happened at some point in the early 1980s. Of course, Passover week quite often covers Good Friday and Easter Sunday - it does this year. -- Laura (emulate St. George for email)
From: Peter T. Daniels on 19 Feb 2010 12:06 On Feb 19, 11:52 am, Evan Kirshenbaum <kirshenb...(a)hpl.hp.com> wrote: > "Peter T. Daniels" <gramma...(a)verizon.net> writes: > > > On Feb 19, 4:34 am, James Hogg <Jas.H...(a)gOUTmail.com> wrote: > >> My Book of Common Prayer makes things easy by pointing out that > >> "the moon referred to in the definition of Easter Day is not the > >> actual moon of the heavens, but the Calendar Moon, or Moon of the > >> Lunar Cycle, which is counted as full on its fourteenth day, > >> reckoned from the day of the Calendar New Moon inclusive." Also, in > >> a Bissextile Year "the number of Sundays after Epiphany will be the > >> same, as if Easter Day had fallen one day later than it really > >> does." > > > Which is why Easter and Passover rarely coincide -- we happen to have > > had a spate of coincidence in recent years, but that'll soon be over. > > Which years were those? I had thought that the current Easter rules > made it impossible for it to fall on the 15th of Nissan. I think it was two years ago that the first night of Passover was on Holy Thursday (or vice versa), which precisely reproduced the historical occasion. Why would the "current" Easter rules have such a restriction? There's certainly nothing about it in the several pages of small type in the front of the Book of Common Prayer (1928), which I read plenty of times while waiting for Morning Prayer to end.
From: Yusuf B Gursey on 19 Feb 2010 12:20
On Feb 19, 10:59 am, António Marques <antonio...(a)sapo.pt> wrote: > Yusuf B Gursey wrote (19-02-2010 15:35): > > > the Orthodox (Eastern) churches have a slightly different system. > > dunno exactly what it is. > > Afaik the system is the same, it's March 21 that is different. but for the Orthodox, the Gregorian calendar has been accepted for other holidays. the Monophysites (Copts, Armenians, Jacobite Syrians) observe Christmas at a different date for other reasons. |