In uk.sci.astronomy message , Sun,
24 Feb 2008 02:20:09, Dentist posted:
Dr J R Stockton wrote;
Judging from quotations elsewhere, that will be Butcher's algorithm.

It is indeed. Meeus merely states that it was devised in 1876 and
appeared in Butcher's Ecclesiastical Calendar, then Spencer Jones'
General Astronomy 1922, then in the journal of the BAA, Vol. 88 (Dec.
1977).

Otto Mortensen's book, "Jens Olsen's Clock, a technical description",
gives a detailed description of the method of calculation used for the
calendar work, albeit with small printing errors, but it fails to
indicate the origin of the 15 year period called the "cycle of
indiction" used in the calculation, other than to say that it has no
connection with astronomical periods.

No 15-year period is used in the calculation of Julian or Gregorian
Easter.


A simple search shows that a copy of the book is on sale in Canterbury :
http://www.ilab.org/db/book723_25648.html.

--
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