I ran several simulation to get the precise hilal or bright waxing crescent as
to compare the result against rule-based machine computed Hijri calendar. As
of now, the result is different. The lag is one day. My result is one day
earlier than its counterpart.
My question is "Did I do something wrong?"
My Stellarium version = 0.11.1
Location of observation = Bekasi City
System date & time = computer date (GMT +7)
1 Ramadhan 1433H = July 19, 2012
1 Syawal 1433H = August 18, 2012
Image = http://www.facebook.com/media/set/?set=a.10151051372402179.457870.831
Thank you for the attention and response(s)
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I ran the simulation for Bekasi, Indonesia. The result is one day later than
what you've mentioned.
The beginning of the lunar Hijri month is the day after the crescent sets
after the sun.
2012-7-17 moon sets around 16:18 sun sets around 17:51
2012-7-18 moon sets around 17:09 sun sets around 17:52
2012-7-19 moon sets around 18:00 sun sets around 17:52 ===> Ramadan is next
day or day after 7-20 or 7-21 depending on crescent sighting.
for Shawwal moon sets 18:24 after the sun 17:53 on August 18th which means
next day is first of Shawwal corresponding to August 19th.
You might want to read this: http://www.skyandtelescope.com/observing/objects
Thanks hendrik_d. Nice informative article.
is there plugin hijri calendar for stellarium that
- automatically appear, and
- we can set the criteria of hilal by self ?
if there is not, how can we make it ?...
You can open book "Calendrical Calculations", read it and implemented on Qt/C++
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