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Once again, Indonesia's two largest Muslim organizations, Muhammadiyah and Nahdlatul Ulama, are at loggerheads as to the date of the start and end of the upcoming month of Ramadan, and its associated non-working public holidays.
As has often been the case in the past (2011-10-20, 2010-11-10, 2007-10-12, and 2006-10-24), but not always (2009-11-18), Indonesia's second largest Muslim organization, Muhammadiyah, has decided to declare the date of Muslim events one day before the date announced by Indonesia's largest Muslim organization, Nahdlatul Ulama.
Essentially, the difference stems from Nahdlatul Ulama's reliance on pseudo-observational calculations based on local events (sunset, moonset,...), while Muhammadiyah relies on the Saudi Umm al-Qura calendar.
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