From: Alan@optusnet.com.au   
      
   Dr John Stockton  wrote in news:61jihOBLZ87DFwL9   
   @merlyn.demon.co.uk:   
      
   > JRS:  In article <458d17F58dv7U1@individual.net>, dated Sun, 12 Feb 2006   
   > 10:21:36 remote, seen in news:comp.lang.pascal.borland, Heinrich Wolf   
   >  posted :   
   >>   
   >>I'm sure, easter sunday does NOT differ by a week   
   >>depending on the timezone.   
   >   
   > Agreed.   
   >   
   >> It's calculation is based on GMT   
   >>for all over the christian world.   
   >   
   > Not really.   
   >   
   > The calculation is purely based on dates (unlike, say, some versions of   
   > the Islamic Calendar).  Gregorian Easter was decided in Rome, Julian in   
   > Bithynia; they might well have calculated for the date of the nominal   
   > Moon as seen at Jerusalem.   
   >   
   > It's essentially an integer calculation, and the result repeats every   
   > 5,700,000 years.   
   >   
   > In AD 314, the Council of Arles decided that the same date should be   
   > used everywhere (but not what that date would be).   
   >   
   > I have an algorithm derived, almost completely, from the Calendar Act   
   > via the Prayer Book; that's the true authority for many of us, including   
   > in the USA.   
   >   
      
   As far as I  know Easter Sunday is the first Sunday after the first full   
   moon after the Vernal (Northern hemisphere) Equinox.  It can range from 22   
   March to 25 April.   
      
   See chapter 4 of "Astronomical Formulae for Calculators" by Jean Meeus.   
      
   Also - http://www.oremus.org/liturgy/etc/ktf/app/easter.html   
      
   Alan   
      
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