On 11/12/22 04:53, John Kaufmann wrote:
When I found the questions interesting, I did not imagine how
interesting: that the last day of each month is also the first day of
the following month -- not just for Shaʿbān to Ramadan, but for all
monthly transitions. The implications are fascinating.
There is a reason why serious developers point blank refuse to write
their own calendar library.
That said, your use of "12th hour" suggests that "sunset" and "sunrise"
are (like Gregorian "midnight") formal based on a 24-hour day, not
literal - correct?
It depends.
* Sometimes one uses a standard clock, that breaks a day into 24 hours
of 60 minutes each;
* Sometimes one uses a time piece that breaks the time between sunset
and sunrise into 12 hours, and between sunrise and sunset into 12 hours,
with the length of the hours during daylight being different from those
during the night. By way of example, where I am, the hours at night are
roughly 80 minutes long, whilst the hours during the day are roughly 40
minutes long. Twelfth hour being at roughly 6 AM, with sunrise at
roughly 7:45 AM, then the next 12th hour is at roughly roughly 3:30 PM,
with sunset at roughly 4:15 PM.
* Sometimes one uses a time piece that breaks the day into 12 hours, and
the night into either 3 or 4 watches.
#####
I'm going to assume that LibO starts both the day, and the month at
sunset. For when the exact day is critical, I'll run a script that
calculates when the new moon was first _theoretically_ sighted in Mecca,
Medina, and Jerusalem.
jonathon
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