Which Islamic calendar is commonly used?

[ali moeini]

As for Iran, the religious calender is based on the sighting of the moon by
eye.
So for important months, the religious leaders would go on roof of their
house or some place high and try to see the moon. If it is seen the new
month begins.
I'm no professional and do not know much about how exactly it works, and I
also know only the way Iran's version of Islam calculates it. But I have
heard that this is also used in political means
For example other Arabic countries announced the new month for ending the
fasting period but Iranian goverment announced it a day later and threatend
any Iranian Islamic leaders to not say otherwise.
So it is a difficult thing and I guess it has little to do with
calculation. Sorry beforehand if my knowledge is flawed.

On Thu, Jan 12, 2023, 3:01 PM Fusion Future <qydwhotmail at gmail.com> wrote:

> On 1/11/23 22:02, Andika Triwidada wrote:
> >     So Islamic calendar variants are categorized as below:
> >     [A] Religious: Based on the sighting of the hilal. Actual dates
> > vary by location.
> >     Algorithmic
> >     [B1] Tabular: ICU "civil", Microsoft "HijriCalendar"
> >     [B2] Umm Al-Qura: Saudi Arabia and others, Microsoft
> "UmAlQuraCalendar"
>
> Thank you Andika.
>
> I added the 3 kinds of Islamic calendars in
> https://invent.kde.org/plasma/kdeplasma-addons/-/merge_requests/317
>
> Hope they can cover most cases.
>
> AboutReligious, do you know where I can get the guidance to calculate
> Islamic calendar date according to location (and is it moon position or
> geographical location)? Because Islamic Calendar (Astronomical) in
> libicu does not consider longitude/latitude, but the algorithm does
> calculate moon position, so I am confused here.
>
> Reference:
>
> https://github.com/unicode-org/icu/blob/030fa1a4791ee7c2f58505ebb61253c3032916ec/icu4c/source/i18n/astro.cpp#L1066
>
>
>
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