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Calculate date of Easter or Good Friday

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  Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-24 21:15 +0000
    Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-24 22:54 +0000
      Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-24 23:57 +0100
        Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-24 23:02 +0000
          Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-25 02:00 +0100
            Re: Calculate date of Easter or Good Friday Kaz Kylheku <433-929-6894@kylheku.com> - 2024-02-25 02:27 +0000
            Re: Calculate date of Easter or Good Friday Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2024-02-25 16:58 +0000
              Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-25 18:50 +0100
              Re: Calculate date of Easter or Good Friday Dan Purgert <dan@djph.net> - 2024-02-26 12:43 +0000
          Re: Calculate date of Easter or Good Friday Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-02-24 18:00 -0800
          Re: Calculate date of Easter or Good Friday Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2024-02-26 11:24 -0700
            Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-26 23:20 +0000
              Re: Calculate date of Easter or Good Friday scott@slp53.sl.home (Scott Lurndal) - 2024-02-26 23:31 +0000
                Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-27 12:50 +0100
              Re: Calculate date of Easter or Good Friday James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-02-27 05:02 -0500
                Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-27 22:48 +0000
                  Re: Calculate date of Easter or Good Friday James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-02-27 19:06 -0500
                    Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-28 00:11 +0000
                      Re: Calculate date of Easter or Good Friday James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-02-27 19:24 -0500
                        Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-28 20:47 +0000
                          Re: Calculate date of Easter or Good Friday Keith Thompson <Keith.S.Thompson+u@gmail.com> - 2024-02-28 14:06 -0800
                            Re: Calculate date of Easter or Good Friday Kaz Kylheku <433-929-6894@kylheku.com> - 2024-02-28 22:20 +0000
                          Re: Calculate date of Easter or Good Friday James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-02-29 13:21 -0500
                Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-27 22:50 +0000
                  Re: Calculate date of Easter or Good Friday James Kuyper <jameskuyper@alumni.caltech.edu> - 2024-02-27 19:41 -0500
                    Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-28 13:13 +0100
      Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-25 01:33 +0000
        Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-25 06:20 +0000
      Re: Calculate date of Easter or Good Friday G <g@nowhere.invalid> - 2024-02-26 09:47 +0000
      Re: Calculate date of Easter or Good Friday Joe Pfeiffer <pfeiffer@cs.nmsu.edu> - 2024-02-26 11:20 -0700
        Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-27 10:08 +0100
          Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-27 13:00 +0100
        Re: Calculate date of Easter or Good Friday Michael S <already5chosen@yahoo.com> - 2024-02-27 13:12 +0200
          Re: Calculate date of Easter or Good Friday Michael S <already5chosen@yahoo.com> - 2024-02-27 14:36 +0200
    Re: Calculate date of Easter or Good Friday Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2024-02-25 17:39 +0000
      Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-26 03:12 +0000
        Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 05:20 +0100
          Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-26 14:26 +0000
            Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 16:31 +0100
            [OT] personal things (was Re: Calculate date of Easter or Good Friday) Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 16:43 +0100
          Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-26 14:32 +0000
            [OT] Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 17:10 +0100
              Re: [OT] Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-26 18:26 +0100
      Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-26 11:45 +0100
        Re: Calculate date of Easter or Good Friday Ben Bacarisse <ben.usenet@bsb.me.uk> - 2024-02-26 13:04 +0000
          Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-26 15:46 +0100
            Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 16:17 +0100
              Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 17:15 +0100
        Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-26 14:38 +0000
          Re: Calculate date of Easter or Good Friday scott@slp53.sl.home (Scott Lurndal) - 2024-02-26 16:29 +0000
            Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-26 19:54 +0000
              Re: Calculate date of Easter or Good Friday scott@slp53.sl.home (Scott Lurndal) - 2024-02-26 20:06 +0000
                Re: Calculate date of Easter or Good Friday porkchop@invalid.foo (Mike Sanders) - 2024-02-26 21:18 +0000
                Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-27 00:59 +0000
          Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-26 18:07 +0100
        Re: Calculate date of Easter or Good Friday Janis Papanagnou <janis_papanagnou+ng@hotmail.com> - 2024-02-26 16:09 +0100
        Re: Calculate date of Easter or Good Friday Lew Pitcher <lew.pitcher@digitalfreehold.ca> - 2024-02-26 17:26 +0000
          Re: Calculate date of Easter or Good Friday David Brown <david.brown@hesbynett.no> - 2024-02-27 10:17 +0100
          Re: Calculate date of Easter or Good Friday Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-03 11:05 -0800
        Re: Calculate date of Easter or Good Friday vallor <vallor@cultnix.org> - 2024-02-27 01:28 +0000
          Re: Calculate date of Easter or Good Friday Lawrence D'Oliveiro <ldo@nz.invalid> - 2024-02-27 02:25 +0000
          Re: Calculate date of Easter or Good Friday Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-03 10:03 -0800
      Re: Calculate date of Easter or Good Friday Ben Bacarisse <ben.usenet@bsb.me.uk> - 2024-02-28 01:54 +0000
        Re: Calculate date of Easter or Good Friday Tim Rentsch <tr.17687@z991.linuxsc.com> - 2024-03-03 10:23 -0800

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#383146

Lawrence D'Oliveiro <ldo@nz.invalid> writes:
> On Tue, 27 Feb 2024 19:24:05 -0500, James Kuyper wrote:
>
>> You were the one who interrupted a discussion of the date of Easter by
>> claiming that Easter had been co-opted from pagan celebrations. Many of
>> the customs followed during Easter were co-opted, but not the date,
>> which rendered your comment a non-sequitur.
>
> Remember, you were the one who said that “the point under debate” was 
> “whether the date of Easter was co-opted from a pagan religion”. Not me.

Here's your article from Feb 24:

    From: Lawrence D'Oliveiro <ldo@nz.invalid>
    Newsgroups: comp.lang.c
    Subject: Re: Calculate date of Easter or Good Friday
    Date: Sat, 24 Feb 2024 23:02:36 -0000 (UTC)
    Message-ID: <urdsic$1e8e4$6@dont-email.me>

    On Sat, 24 Feb 2024 23:57:16 +0100, Janis Papanagnou wrote:

    > ... and that there's not a unique definition of Easter.

    Easter, Christmas ... both ancient pagan festivals co-opted by the
    Christians and given an invented meaning under their ideology, for their
    own propaganda purposes.

    Just like they took a lot of existing pagan deities (e.g. in Celtic lands)
    and reinvented them as “saints”.

But I suggest that the point should never have been under debate here,
because it has nothing to do with C.  (C code that calculates the date
of Easter is topical here; debates about holidays being co-opted from
pagan religions are not.)

-- 
Keith Thompson (The_Other_Keith) Keith.S.Thompson+u@gmail.com
Working, but not speaking, for Medtronic
void Void(void) { Void(); } /* The recursive call of the void */

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#383147

On 2024-02-28, Keith Thompson <Keith.S.Thompson+u@gmail.com> wrote:
> because it has nothing to do with C.  (C code that calculates the date
> of Easter is topical here; debates about holidays being co-opted from
> pagan religions are not.)

Easter is topical here to the extent that this is a sort island,
which is rumoured to be inhabited by cannibals.

-- 
TXR Programming Language: http://nongnu.org/txr
Cygnal: Cygwin Native Application Library: http://kylheku.com/cygnal
Mastodon: @Kazinator@mstdn.ca

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#383191

On 2/28/24 15:47, Lawrence D'Oliveiro wrote:
> On Tue, 27 Feb 2024 19:24:05 -0500, James Kuyper wrote:
> 
>> You were the one who interrupted a discussion of the date of Easter by
>> claiming that Easter had been co-opted from pagan celebrations. Many of
>> the customs followed during Easter were co-opted, but not the date,
>> which rendered your comment a non-sequitur.
> 
> Remember, you were the one who said that “the point under debate” was 
> “whether the date of Easter was co-opted from a pagan religion”. Not me.

You're right. That was a misstatement. The point under debate was the
timing of Easter. You're assertion that Easter had been co-opted from
pagan religions would have been relevant if you'd been claiming that the
date of Easter was one of the things that had been co-opted. It would
have been a false claim, but a relevant one. A person could be excused
for thinking that you'd intended to make a relevant comment. However,
you never made that particular assertion, rendering the comment you did
make a non-sequitur. I apologize for mis-characterizing what was wrong
with your comment.

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#383120

On Tue, 27 Feb 2024 05:02:58 -0500, James Kuyper wrote:

> On 2/26/24 18:20, Lawrence D'Oliveiro wrote:
>
>> On Mon, 26 Feb 2024 11:24:29 -0700, Joe Pfeiffer wrote:
>> 
>>> Lawrence D'Oliveiro <ldo@nz.invalid> writes:
>>>
>>>> Easter, Christmas ... both ancient pagan festivals co-opted by the
>>>> Christians and given an invented meaning under their ideology, for
>>>> their own propaganda purposes.
>>>
>>> While that unquestionably true of Christmas, Easter very clearly comes
>>> from Passover.
>> 
>> Easter bunny? Eggs? Both fertility symbols, associated with (northern)
>> spring and the beginning of the planting season? And both with origins
>> older than Christianity and Judaism combined?
>> 
>> Somehow I doubt it.
> 
> He was not talking about Easter customs, he was talking about the
> *definition" of Easter ...

In that case, that argument would also apply to the “definition” of 
Christmas. So that what was “unquestionably true of Christmas” (as stated 
above) must be the date. Which it is not.

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#383128

On 2/27/24 17:50, Lawrence D'Oliveiro wrote:
> On Tue, 27 Feb 2024 05:02:58 -0500, James Kuyper wrote:
...
>> He was not talking about Easter customs, he was talking about the
>> *definition" of Easter ...
> 
> In that case, that argument would also apply to the “definition” of 
> Christmas. So that what was “unquestionably true of Christmas” (as stated 
> above) must be the date. Which it is not.

No, the date of Christmas was co-opted from a pagan Roman celebration.
The date of Easter was based upon Jewish traditions for Passover. With
modifications, to be sure - but those modifications were not co-opted
from pagan religions, they were due to a disagreement about the details
of the rules for the Hebrew calendar.

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#383134

On 28/02/2024 01:41, James Kuyper wrote:
> On 2/27/24 17:50, Lawrence D'Oliveiro wrote:
>> On Tue, 27 Feb 2024 05:02:58 -0500, James Kuyper wrote:
> ...
>>> He was not talking about Easter customs, he was talking about the
>>> *definition" of Easter ...
>>
>> In that case, that argument would also apply to the “definition” of
>> Christmas. So that what was “unquestionably true of Christmas” (as stated
>> above) must be the date. Which it is not.
> 
> No, the date of Christmas was co-opted from a pagan Roman celebration.
> The date of Easter was based upon Jewish traditions for Passover. With
> modifications, to be sure - but those modifications were not co-opted
> from pagan religions, they were due to a disagreement about the details
> of the rules for the Hebrew calendar.

Exactly.

There is clear Biblical justification for saying that the key Christian 
religious events connected with Easter (centring on Jesus' claimed death 
and resurrection) have a date directly related to the Jewish Passover at 
that time.  There is no Biblical justification for suggesting that the 
the religious events of Christmas (the birth of Jesus) occurred in the 
middle of winter or at any other particular time.  (And there is no 
evidence for any of this from non-Biblical sources, including, AFAIK, 
other early Christian writings.)  The date set for Christmas is thus 
completely arbitrary from the religious viewpoint - it was picked to 
co-opt existing mid-winter festivals.

You could go further back if you like - you could reasonably argue that 
the date for the Jewish Passover was co-opted from older Canaanite 
spring festivals.  Basically, every culture and religion has had a 
variety of festivals, and mid-winter, spring, mid-summer and autumn 
(harvest time) are peaks for these.  And every culture and religion that 
has spread to other areas has either merged their festivals, co-opted 
them, or overridden them, adapting old traditions and inventing new ones.

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#382991

Lawrence D'Oliveiro <ldo@nz.invalid> wrote:

> Did you know that one of the requirements of the rules was that Easter 
> would never coincide with Passover? Because the sight of Christians 
> celebrating together with Jews was seen as heretical or something ...

Oh yeah, lots of horror stories committed by & against the 'us & them'.
Isn't a culture on the planet, so far as I can see, that has not been
both prey & predacious. I want to say something like 'that's life',
but its not a very satisfying reply...

-- 
:wq
Mike Sanders

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#383000

On Sun, 25 Feb 2024 01:33:35 -0000 (UTC), Mike Sanders wrote:

> Oh yeah, lots of horror stories committed by & against the 'us & them'.
> Isn't a culture on the planet, so far as I can see, that has not been
> both prey & predacious. I want to say something like 'that's life', but
> its not a very satisfying reply...

You know how most of these religions have, as one of their core 
principles, that “our god is the only true god, all other gods are false”?

If they would all agree to get rid of that, it would be a good step on the 
road to religious tolerance.

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#383029

Lawrence D'Oliveiro <ldo@nz.invalid> wrote:
> On Sat, 24 Feb 2024 21:15:56 -0000 (UTC), Mike Sanders wrote:
> 
>> Calculate the date of Easter Sunday or Good Friday:
> 
> Did you know that one of the requirements of the rules was that Easter 
> would never coincide with Passover? Because the sight of Christians 
> celebrating together with Jews was seen as heretical or something ...

I have never heard of this one and I don't think it's true...

Easter is a day while passover last eight days and it happens that one of
those days is the easter sunday as in 2022 when passover started April 15 and
ester was April 17.

The calculation of easter is quite complex and use the "epact" and "golden
number" associated to the year, but the short answer "the first sunday after
the full moon after the spring equinox" usually gives the right answer.
Just remember that it is the "official spring equinox" March 21 and not the
"real" one that can happen on the 19,20(usually, like this year)  
 or 21 and the "official full moon" that can differ one or two days from the
"real". 

For a full discussion see: <https://www.tondering.dk/claus/cal/easter.php>,
part of "The Calendar FAQ".

G

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#383054

Lawrence D'Oliveiro <ldo@nz.invalid> writes:

> On Sat, 24 Feb 2024 21:15:56 -0000 (UTC), Mike Sanders wrote:
>
>> Calculate the date of Easter Sunday or Good Friday:
>
> Did you know that one of the requirements of the rules was that Easter 
> would never coincide with Passover? Because the sight of Christians 
> celebrating together with Jews was seen as heretical or something ...

That's an Eastern Orthodox rule, not Western.  Last year (western)
Easter was April 9, while Passover was April 5 through 13 (this year
they don't overlap).

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#383090

On 26/02/2024 19:20, Joe Pfeiffer wrote:
> Lawrence D'Oliveiro <ldo@nz.invalid> writes:
> 
>> On Sat, 24 Feb 2024 21:15:56 -0000 (UTC), Mike Sanders wrote:
>>
>>> Calculate the date of Easter Sunday or Good Friday:
>>
>> Did you know that one of the requirements of the rules was that Easter
>> would never coincide with Passover? Because the sight of Christians
>> celebrating together with Jews was seen as heretical or something ...
> 
> That's an Eastern Orthodox rule, not Western.  Last year (western)
> Easter was April 9, while Passover was April 5 through 13 (this year
> they don't overlap).

Are you sure it is a rule at all?

In one of the early counsels establishing the "official" doctrine of the 
early Christian (Catholic) church, the date system for holy days was 
defined as independent of the Hebrew calendar.  That meant that the 
system for determining the date of Easter was not the same as for the 
Jewish Passover, and they did not have to match up.  But it /also/ meant 
that they could, coincidentally, occur at the same time.

Did the Eastern Orthodox church specifically add this rule afterwards? 
I thought the Eastern Orthodox churches used basically the same 
algorithm as the Western churches, just with a different calender and (I 
think) a slightly different way to define their "lunar" cycles.  (I put 
"lunar" in quotation marks, since neither Eastern nor Western "lunar" 
cycles matches exactly with the moon.)

My knowledge of the details of Eastern Orthodox churches is shaky at 
best, so I could be getting this wrong.

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#383098

On 27.02.2024 10:08, David Brown wrote:
> [...] I
> thought the Eastern Orthodox churches used basically the same algorithm
> as the Western churches, [...]

That was the impression I got when skimming through the Wikipedia
articles.[*]

Janis

[*] See chapter "Gültigkeit" on
https://de.wikipedia.org/wiki/Gau%C3%9Fsche_Osterformel
which says that (at least the Gauss') calculation applies to Julian
and Gregorian calendars, and at the end of the next chapter explains
the parameters for Julian calendar and that it can easily be adjusted
for the Gregorian by   OS_Ost = OS + (X div 100) − (X div 400) − 2.

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#383093

On Mon, 26 Feb 2024 11:20:14 -0700
Joe Pfeiffer <pfeiffer@cs.nmsu.edu> wrote:

> Lawrence D'Oliveiro <ldo@nz.invalid> writes:
> 
> > On Sat, 24 Feb 2024 21:15:56 -0000 (UTC), Mike Sanders wrote:
> >  
> >> Calculate the date of Easter Sunday or Good Friday:  
> >
> > Did you know that one of the requirements of the rules was that
> > Easter would never coincide with Passover? Because the sight of
> > Christians celebrating together with Jews was seen as heretical or
> > something ...  
> 
> That's an Eastern Orthodox rule, not Western.  Last year (western)
> Easter was April 9, while Passover was April 5 through 13 (this year
> they don't overlap).

This year Western Easter does not overlap with Passover because of
approximately four day difference in definition of official start of
Spring. When there is a full moon between 21st and 24th of Martch, by
Western rules it's already Spring, but by Jewish rules it's still
Winter and does not count.
It happens approximately 3 times in 19-year cycle. Or, may be, exactly
3 times, I don't know for sure.
So, it seems, Western Easter overlaps with Passover in overwhelming
majority of years - 16 out of 19.

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#383101

On Tue, 27 Feb 2024 13:12:44 +0200
Michael S <already5chosen@yahoo.com> wrote:

> On Mon, 26 Feb 2024 11:20:14 -0700
> Joe Pfeiffer <pfeiffer@cs.nmsu.edu> wrote:
> 
> > Lawrence D'Oliveiro <ldo@nz.invalid> writes:
> >   
> > > On Sat, 24 Feb 2024 21:15:56 -0000 (UTC), Mike Sanders wrote:
> > >    
> > >> Calculate the date of Easter Sunday or Good Friday:    
> > >
> > > Did you know that one of the requirements of the rules was that
> > > Easter would never coincide with Passover? Because the sight of
> > > Christians celebrating together with Jews was seen as heretical or
> > > something ...    
> > 
> > That's an Eastern Orthodox rule, not Western.  Last year (western)
> > Easter was April 9, while Passover was April 5 through 13 (this year
> > they don't overlap).  
> 
> This year Western Easter does not overlap with Passover because of
> approximately four day difference in definition of official start of
> Spring. When there is a full moon between 21st and 24th of Martch, by
> Western rules it's already Spring, but by Jewish rules it's still
> Winter and does not count.
> It happens approximately 3 times in 19-year cycle. Or, may be, exactly
> 3 times, I don't know for sure.
> So, it seems, Western Easter overlaps with Passover in overwhelming
> majority of years - 16 out of 19.
> 

P.S.
Eastern Easter, more properly called Pascha, rarely coincides with
Passover week, but not by ideological design, as insinuated by Lawrence
D'Oliveiro. It happens because, due to accumulated errors, Julian
Spring starts ~15 days after solar equinox while Jewish Spring starts
~5 days after solar equinox*.

Despite that, sometimes Pascha does happen during Passover. The next
such time will be in 2028, where Pascha will be in the last day of
Passover. I would think that few centuries ago it happened more often
and 1000 years ago it happened most of the time. 

* - it's more complicated, really, but for practical purposes of
  calculation of Passover day the above holds.

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#383010

On Sat, 24 Feb 2024 21:15:56 +0000, Mike Sanders wrote:

> Calculate the date of Easter Sunday or Good Friday:
> 
> https://busybox.neocities.org/notes/is-easter-or-goodfriday.txt

I don't have the expertise to discuss whether or not your code
properly implements the calculations necessary to determine the
date of Good Friday and/or Easter. However, I /do/ have some
expertise on writing understandable code.

My suggestions, with respect to your program, would be to
a) name your objects with relevant, understandable names
   You code uses quite a lot of meaningless one-letter
   objects, and it is difficult to keep track of the
   purpose of the calculations using them.
b) Don't place your calculations /in/ the object initializations.
   Doing so obfuscates the intent of the logic, and makes
   problem determination and resolution difficult.

Otherwise, it /appears/ to do the job. Good first attempt.
-- 
Lew Pitcher
"In Skills We Trust"

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#383023

Lew Pitcher <lew.pitcher@digitalfreehold.ca> wrote:

> I don't have the expertise to discuss whether or not your code
> properly implements the calculations necessary to determine the
> date of Good Friday and/or Easter. However, I /do/ have some
> expertise on writing understandable code.

One thing while I'm thinking about it: allot of discussion up-thread
failed to note that officially mandated Easter dating is really
based a Lunar date mapped onto the Gregorian calendar. Yet another
layer of abstraction.
 
> My suggestions, with respect to your program, would be to
> a) name your objects with relevant, understandable names
>    You code uses quite a lot of meaningless one-letter
>    objects, and it is difficult to keep track of the
>    purpose of the calculations using them.
> b) Don't place your calculations /in/ the object initializations.
>    Doing so obfuscates the intent of the logic, and makes
>    problem determination and resolution difficult.
> 
> Otherwise, it /appears/ to do the job. Good first attempt.

Thanks Lew appreciate the helpful comments, still a newbie,
I move forward if ever so slowly.

-- 
:wq
Mike Sanders

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#383024

On 26.02.2024 04:12, Mike Sanders wrote:
> 
> One thing while I'm thinking about it: allot of discussion up-thread
> failed to note that officially mandated Easter dating is really
> based a Lunar date mapped onto the Gregorian calendar. [...]

Not sure which instance of "official" you are referring to; there's
just no "official" mandate unless you are restricting yourself to a
global authority instance (which does not exist) or not considering
that any single instance cannot define a "general" rule that would
be valid worldwide. Face it; Easter dates just differ on this planet!

The "western" churches switched to Gregorian calendar while the
"eastern" churches stayed with the Julian _to calculate the Easter
date_. (Both based on lunar constellation, but that's irrelevant.)

I suggest to leave your country, visit (for example) Greece, and ask
the people there what they think about your definition. Or take the
simple approach; inspect Wikipedia or other established encyclopedias.

And both dates, western and eastern, are anyway arbitrary. But if you
decide to neglect the existing facts, either by wrongly assuming that
there's only one "correct" Easter date, or by (arrogantly?) presuming
that one is more correct than the other, then you are discriminating
Christian folks that follow the one [arbitrary] definition (or the
other).

Janis

PS: Just to prevent you from a fallacy; for the date calculation of
Easter it's irrelevant whether "we" have "now" switched to Gregorian
calendar [mostly]. (Think about it before you step into that pit.)

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#383033

Janis Papanagnou <janis_papanagnou+ng@hotmail.com> wrote:

> Not sure which instance of "official" you are referring to; there's
> just no "official" mandate unless you are restricting yourself to a
> global authority instance (which does not exist) or not considering
> that any single instance cannot define a "general" rule that would
> be valid worldwide. Face it; Easter dates just differ on this planet!

The inference is the 'official' governance of a given municipality or
provence using the Gregorian calendar (updated the URL notes last night
to, I hope, clarify)...

> PS: Just to prevent you from a fallacy; for the date calculation of
> Easter it's irrelevant whether "we" have "now" switched to Gregorian
> calendar [mostly]. (Think about it before you step into that pit.)

Not me =) I'm not touching the Julian variant, heck I got lucky (and
spent way too much time) with the one I cobbled together as it is.

So tell me, what are you coding these days? Haven't seen much from you
lately...

-- 
:wq
Mike Sanders

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#383043

On 26.02.2024 15:26, Mike Sanders wrote:
> Janis Papanagnou <janis_papanagnou+ng@hotmail.com> wrote:
> 
>> Not sure which instance of "official" you are referring to; there's
>> just no "official" mandate unless you are restricting yourself to a
>> global authority instance (which does not exist) or not considering
>> that any single instance cannot define a "general" rule that would
>> be valid worldwide. Face it; Easter dates just differ on this planet!
> 
> The inference is the 'official' governance of a given municipality or
> provence using the Gregorian calendar (updated the URL notes last night
> to, I hope, clarify)...

(Despite my note you stepped into the fallacy trap.)

One final try to help you here: Greece, like most other countries in
the world, uses the Gregorian calendar. The Greek orthodox church, as
just one example of eastern churches, has not changed the calculation
for Easter. That's not a mistake.

> 
>> PS: Just to prevent you from a fallacy; for the date calculation of
>> Easter it's irrelevant whether "we" have "now" switched to Gregorian
>> calendar [mostly]. (Think about it before you step into that pit.)
> 
> Not me =) I'm not touching the Julian variant, heck I got lucky (and
> spent way too much time) with the one I cobbled together as it is.

The Wikipedia sources I provided elsethread show both existing Easter
calculations that are in use world wide. So it's easy to reflect the
real world in your code in a non-discriminating way. But if you prefer
to ignore hundreds million orthodox Christians[*] that's of course
completely your decision.

Janis

[*]
https://de.wikipedia.org/wiki/Liste_der_L%C3%A4nder_nach_christlicher_Bev%C3%B6lkerung

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#383044 — [OT] personal things (was Re: Calculate date of Easter or Good Friday)

On 26.02.2024 15:26, Mike Sanders wrote:
> 
> So tell me, what are you coding these days? Haven't seen much from you
> lately...

Wasn't it you who asked me (probably in the Awk newsgroup) to create
a web page (or use github) to post all my tools? - If so then I'm
surprised that you're asking again since I already told you that I
don't post my personal projects unless there's a concrete demand.

Have you any concrete demands for some code? - The please tell me
and I'll see whether I can provide something for you.

Janis

PS: I acknowledge if you seem to have some urge to post lots of code
(as I recall from the Awk NG), and that's fine - despite I'd wished
you'd take more care in quality, but since it's your code you define
the rules for your code (amount, frequency, quality). From me you'll
get hints and suggestions, and that's all.

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