[Help] Moon and Hijri Calendar Simulation

  • Dwi Santoso

    Dwi Santoso - 2012-07-24

    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?"

    Technical info:
    My Stellarium version = 0.11.1
    Location of observation = Bekasi City
    System date & time = computer date (GMT +7)

    The result:
    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)

  • Kajaji

    Kajaji - 2012-07-27

    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.

  • Kajaji

    Kajaji - 2012-07-27

    Thanks hendrik_d. Nice informative article.

  • Anonymous - 2013-02-21

    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 ?...


    • Alexander Wolf

      Alexander Wolf - 2013-03-04

      You can open book "Calendrical Calculations", read it and implemented on Qt/C++



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