Please unsubscribe me On Fri, Mar 22, 2019 at 5:00 AM [email protected] < [email protected]> wrote:
> Dear Frank, > > ... ANSI Standard Easter, I missed it, I hope none of the international > authorities for the standards read this mailing-list :-) > > Even Gauss took care of it but his algorithm doesn't manage some > exceptions. > > For those interested in the matter: > Algorithm to calculate the date of Easter, by Spencer Jones, from his book > General Astronomy, pages 73-74, edition of 1922. > Published again in the Journal of the British Astronomical Association, > vol. 88, page 91, december 1977. > Here it is reported that the algorithm was defined on 1876 and it appeared > in the Butcher's Ecclesiastical Calendar. > Unlike the algorithm of Gauss, this hasn't exceptions and it runs for the > Gregorian Calendar, starting from 1583. > > The limits of the dates are march 22 and april 25. > The dates of Easter have a cycle of 5,700,000 years. > The most frequently date is april 19. > > Example for 2019: > A=5, B=20, C=19, D=5, E=0, F=1, G=6, H=29, J=4, K=3, L=1, M=0, N=4, P=20 > N=4 that is april, P+1=21 > > The Orthodox Easter follows the Julian Calendar, the algorithm is: > > > The cycle of the dates of the Julian Easter is 532 years. > > Example for 2019: > A=3, B=3, C=5, D=20, E=4, F=4, G=14 > N=4 april, G+1=15, in the Gregorian Calendar 15+13=28 > > ciao Fabio > > > Il 21/03/2019 15:35, Frank King ha scritto: > > Dear Roger, > > I note that you say: > > > My reference on this topic is The Sun in > the Church by J L Heilbron. > > He is pretty sound on this and, as early > as page 3, notes that the time of the > equinox and the time of full moon depend > where you are on the planet. He adds, > "as, of course does Sunday". > > If everyone used the Julian Date then > they might all agree on the instant of > the equinox and the instant of full > moon but it seems most unlikely that > they would have similar agreement as > to what is meant by "Sunday". > > It takes 48 hours from the start of a > given Sunday, just to the west of the > International Date Line, to the end of > the same Sunday, just to the east of > the Line. > > Fabio has pointed out that Rome and > Jerusalem have been suggested as > candidate places for defining a > Canonical Sunday. I too have read > this but I don't know where the > supposed primary source is. > > I think Fabio's explanation is the > most plausible. In essence, you > define an algorithm (albeit one > that is a bit suspect) and impose > a kind of ANSI Standard Easter :-) > > As a former colleague once told me: > "The great thing about having Standards > is that there are so many of them." > > You are one of the most-westerly > subscribers to this list so I think > a Bailey-Standard Easter would be > worth lobbying for. > > You might thereby become a noted > Holy Man. Be careful! > > Very best wishes > > Frank > > ---------------------------------------------------https://lists.uni-koeln.de/mailman/listinfo/sundial > > -- > Fabio [email protected] > Paderno Dugnano, Milano, Italy > 45° 34' 9'' N, 9° 9' 54'' E, UTC +1 (DST +2) > > > --------------------------------------------------- > https://lists.uni-koeln.de/mailman/listinfo/sundial > >
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