Re: announce: www-rdf-calendar mailing list

On Thu, 12 Apr 2001, Greg FitzPatrick wrote:

  *Maundy Thursday

Which reminds me:

One of the things Iwanted to be able to do is  work with different calendars
- e.g. Muslim calendar, Jewish Calendar, comparison of modern Gregorian
Calendar with older variants of such for historical purposes such as
understanding  why the "October Revolution" didn't happen in what I always
imagine when I think of October 1917, etc.

One of the best use cases I  came up with was figuring out when Greek
Orthodox churches and Australian Protestant churches celebrate easter at the
same time.

Thursday before first Sunday after first full moon after (southern
hemisphere) autumn eqiunox is my belief about how to calculate maundy
thursday for australian protestant churches. I don't actually know what part
of the rule differs for greek churches, just that sometimes, like this year,
easter is the same time, and sometimes it is different.

So the important requirements:

A way of talking about what calendar is being used, and of relating that to
at least one other calendar.

A way of specifying cyclic events (obvious requirement)

A way of specifying one event as occurring based on the time of some other
event

For example:
full moon occurs every 28.(a bit) days, and one of those days in ISO xxxx
time is yyyy

or
Southern Hemisphere seasonal calendar
Autumn Equinox occurs on northern hemisphere seasonal calendar spring Equinox

or
Anglican church of Australia Calendar
Maundy Thursday 2001 occurs on ISO xxxxyyyyzzzz
Good Friday 2001 occurs Greek Orthodox Church calendar Good Friday 2001 (??)
Palm Sunday 2001 occurs z days after MyCalendar Beltane xyzyx

cheers

Chaals

(PS a lot of calendaring is not religious, but a remarkable amount of it
is...)

-- 
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Received on Thursday, 12 April 2001 06:00:52 UTC