Re: Use Vim to compute the date of Easter

P.P.P.S. For a more precise list of dates of changes back and forth,
see https://en.wikipedia.org/wiki/List_of_adoption_dates_of_the_Gregorian_calendar_per_country

Best regards,
Tony.

On Sun, May 3, 2020 at 8:36 AM Tony Mechelynck
<antoine.mechelynck@gmail.com> wrote:
>
> On Sat, May 2, 2020 at 8:05 PM 'Chris Willis' via vim_use
> <vim_use@googlegroups.com> wrote:
> > Known limitation: the input must be an integer (or a String or Float
> > which will be converted to an Integer) > 1582, and only _Gregorian_
> > Easter dates are produced. If you want to compute Julian (Orthodox)
> > Easter, or Pesach, or the Chinese New Year, or something else, go
> > ahead and write them: they are not the purpose of this script, which
> > "does one thing, does it predictably, and doesn't try to do a lot of
> > other things on the side".
> >
> > Have fun!
> > Tony.
> >
> > Hi Tony
> >
> > I'm not sure where you're based. You realise, I expect, that England (and I
> > think the USA) didn't change to the Gregorian calendar until 1752. I'm not
> > sure whether all western Europe celebrated Easter on the same day despite
> > the different dates in the interim. It wd appear not.
> >
> > regards - Chris
>
> Well, no one celebrated Easter according to the Gregorian computus
> before the Gregorian calendar reform (October 1582); someone (Spain,
> Portugal, the Papal states, much of Italy, France (as it existed at
> the time), the united Kingdom of Poland and Grand-Duchy of Lithuania,
> …) did as soon as 1583; so it doesn't make sense to use that formula
> before 1583 but from that date it does. Catholic, Protestant and
> Anglican countries and churches adopted the Gregorian calendar at
> various dates in October 1582 or later; nowadays they all use it. OTOH
> Orthodox churches usually still use the Julian calendar even though
> the civil administration in the same countries uses Gregorian, so
> their Easter may or may not be on the same day, sometimes it's one
> week apart, sometimes it's one lunar month apart, so don't use this
> little program for that, or to know when Easter happened in England in
> 1600 (if you ask for 1600 you'll get an answer but it will be the date
> for, among others, Spain and Portugal).
>
> If you (or anyone) want to know when your country adopted the
> Gregorian calendar, see
> https://en.wikipedia.org/wiki/Gregorian_calendar#Adoption_of_the_Gregorian_Calendar
> — Austria is not mentioned but from the note at "Yugoslavia" you can
> deduce that Austria-Hungary switched over in 1583, shortly before the
> "Kingdom of Bohemia" (which approximately corresponds to present-day
> Czech Republic). Present-day Netherlands are "Protestant Low
> Countries" of course, except that IIRC North Brabant and Limburg were
> Catholic and under Spanish rule (for Dutch Flanders I'm not sure); and
> beware that Strasbourg changed at a different date from the rest of
> Alsace and that neither was part of "France" in 1582. For Lorraine see
> the note in the rightmost column of the table at
> https://en.wikipedia.org/wiki/Gregorian_calendar#Beginning_of_the_year
>
> P.S. I live in Brussels, Belgium, which was then part of "Catholic Low
> Countries" and under Spanish rule.
>
> P.P.S. Gauss invented as a child the formula on which this method is a
> minor improvement because he wanted to know his birthday: his mother
> only remembered that is was "on a Wednesday, one week before Ascension
> day". Germany had made the changeover more than 70 years before he was
> born, so he used Gregorian computus.
>
>
> Best regards,
> Tony.

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