Dear Frank
the replay at your question is not easy.
I see some ways to find it:
- one is exhaustive, few lines of software could check how many times
the naive rule is verified in the whole cycle. It isn't very smart but
it may be useful to verify the other points
- to disassemble the algorithm finding where and when it intervenes to
shift the date
- reformulate an approach to find when the sunday overlap the canonical
full moon but I think I would find myself in the previous point, with
the formulation of epacts of Clavius
- to consult the book of Tempesti where there are many kind of tables
and considerations on this matter, may be the answer is already written.
At first I think to follow the last point, unluckily I lent the book and
it come back to me in the next days, I'll come back on the matter as
soon as the book returns to my hands.
Yesterday I went to sleep thinking about the 3rd point, obviously I
didn't solve my question but I dreamed my 'Sunday': I was going to an
heliodrome with an ice cream :-)
ciao Fabio
Il 22/03/2019 17:02, Frank King ha scritto:
Dear Fabio,
I think the Spencer-Jones algorithm is
now widely accepted as defining when
Easter will be observed (by both the
Roman Catholic Church and the Anglican
Church for the foreseeable future).
What is interesting is just how often
it produces the same date as the naive
rule of 'the first Sunday after the
first full moon after the equinox'.
This year is clearly an exception
because the algorithm and the
naive rule give different answers.
Do you know how often the algorithm
and the naive rule differ?
You are allowed to choose your own
defintion of 'Sunday'!
Ciao Frank
--
Fabio Savian
fabio.sav...@nonvedolora.it
www.nonvedolora.eu
Paderno Dugnano, Milano, Italy
45° 34' 9'' N, 9° 9' 54'' E, UTC +1 (DST +2)
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