Your message dated Thu, 28 May 2020 10:44:52 +0200
with message-id <[email protected]>
and subject line Re: Bug#786931: /usr/bin/ncal: Lunar calenders (Islam and
Jewish)
has caused the Debian Bug report #786931,
regarding /usr/bin/ncal: Lunar calenders (Islam and Jewish)
to be marked as done.
This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.
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--
786931: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=786931
Debian Bug Tracking System
Contact [email protected] with problems
--- Begin Message ---
Package: bsdmainutils
Version: 9.0.6
Severity: wishlist
File: /usr/bin/ncal
Tags: upstream
Dear Maintainer,
I was interested in adding support to cal/ncal for the Jewish and Islamic
lunar calenders (specifically the Umm al-Qura Islamic calender standardized in
Saudi
Arabia), and as there is a fair bit of math involved, asking
if such a patch would be considered (with no guarantee) in advance.
Islamic calender
----------------
The days are purely lunar, with a "year" being exactly 12 moons. These moons
are differn't
from a rotation of the Moon around the Earth, with details (look at the source)
here:
http://www.staff.science.uu.nl/~gent0113/islam/ummalqura.htm
Jewish calender
---------------
A modified lunar calender, there is a leap month (Adar) entered according to the
metonic cycle. There are also some special leap day(s) rules discussed here:
https://en.wikipedia.org/wiki/Hebrew_calendar#Rosh_Hashanah_postponement
For current day calculation
---------------------------
Days in Judaism and Islam start at sunset. The user may either provide a
latitude and longitude[1], or by default the coordinates of Jerusalem or Mekkah
will be used,
respectfully. Existing timezones cannot be used (the latitude where that time
would
be the mean solar time) because sunsetcalculations requie a latitude.
For days in with the artic or antartic circle in which the sun either does
not set or does not rise, solar midnight will be used (days are not 24 hours
long).
Rounding errors
---------------
The solar declination calculation is subject quite a bit to rounding errors.
When using
IEEE-754 64-bit the avr-libc library reports a 4.8 minute drift of solstice per
year,
which becomes significant with the historical Jewish calender (but not the
modern Islamic
calender). So if historical Jewish dates are desired, libquadmath should be
used.
Liberty equality fraternity or death,
Shawn Landden
[1]Or, optionally, only a latitude (and get the longitude from the mean solar
time of the current timezone)?
-- System Information:
Debian Release: 8.0
APT prefers unstable
APT policy: (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Foreign Architectures: musl-linux-arm64
Kernel: Linux 3.2.0-4-amd64 (SMP w/1 CPU core)
Locale: LANG=en_US.UTF-8, LC_CTYPE=en_US.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
Versions of packages bsdmainutils depends on:
ii bsdutils 1:2.25.2-6
ii debianutils 4.4+b1
ii libc6 2.21-0experimental0
ii libncurses5 5.9+20140913-1+b1
ii libtinfo5 5.9+20140913-1+b1
bsdmainutils recommends no packages.
Versions of packages bsdmainutils suggests:
ii cpp 4:5-3
pn vacation <none>
ii wamerican [wordlist] 7.1-1
ii whois 5.2.7
-- no debconf information
--- End Message ---
--- Begin Message ---
On Tue, May 26, 2015 at 09:20:25PM +0000, Shawn Landden wrote:
> Package: bsdmainutils
> Version: 9.0.6
> Severity: wishlist
> File: /usr/bin/ncal
> Tags: upstream
>
> Dear Maintainer,
>
> I was interested in adding support to cal/ncal for the Jewish and Islamic
> lunar calenders (specifically the Umm al-Qura Islamic calender standardized
> in Saudi
> Arabia), and as there is a fair bit of math involved, asking
> if such a patch would be considered (with no guarantee) in advance.
> ...
This bug is waiting for details for 4 years without any action. Assuming that
you lost interest I go ahead and close the bug. Should you still have interest,
feel free to send a patch directly or re-open the bug.
Michael
--
Michael Meskes
Michael at Fam-Meskes dot De, Michael at Meskes dot (De|Com|Net|Org)
Meskes at (Debian|Postgresql) dot Org
Jabber: michael at xmpp dot meskes dot org
VfL Borussia! Força Barça! Go SF 49ers! Use Debian GNU/Linux, PostgreSQL
--- End Message ---
