Indonesia Mandates 30-Day Ramadan as Idulfitri Lands on Saturday

JAKARTA, Investortrust.id — The Indonesian government, through the Ministry of Religious Affairs, officially decreed that 1 Syawal 1447 Hijriah—the first day of the Idulfitri holidays—will fall on Saturday, March 21, 2026. The announcement came late Thursday following a high-stakes "Sidang Isbat," the traditional collective deliberation used to determine the Islamic lunar calendar.

Religious Affairs Minister Nasaruddin Umar confirmed the consensus after a comprehensive session involving Islamic organizations, astronomers, and state scientific agencies including the BMKG (Meteorology, Climatology, and Geophysics Agency) and BRIN (National Research and Innovation Agency). The decision effectively extends the month of fasting for one additional day.

For Indonesia, the world’s most populous Muslim-majority nation, the timing of Idulfitri is more than a religious milestone; it is a massive economic catalyst. The holiday triggers "Mudik," an annual exodus where tens of millions of people travel from urban centers to their home villages, a phenomenon that provides a significant seasonal boost to domestic consumption and the transportation sector.

The Math of the Moon

The determination hinged on the "MABIMS" criteria, a technical standard shared by Brunei, Indonesia, Malaysia, and Singapore. Under these rules, the new moon, or hilal, is only recognized if it reaches a minimum altitude of 3 degrees and an elongation (the angular distance between the sun and moon) of 6.4 degrees.

Data presented by the Ministry’s expert team showed the moon’s position over the archipelago ranged between a mere 0.91 degrees and 3.13 degrees, with elongation levels between 4.54 and 6.10 degrees. While the moon was technically above the horizon in some areas, it lacked the physical prominence required to be visible to the naked eye or through standard telescopic equipment.

"Across the entire territory of the Republic of Indonesia, the criteria for the start of the new month were not met," stated Cecep Nurwendaya, a member of the Ministry’s observation team. He noted that lower altitudes often cause the faint light of the hilal to be drowned out by the "syafaq," or the twilight’s afterglow.

A Unified Conclusion

To verify the mathematical models, the government deployed observers to 117 locations stretching roughly 3,100 miles (5,000 km) from the eastern province of Papua to the western tip of Aceh. Not a single post reported a confirmed sighting.

Minister Nasaruddin Umar emphasized that the Sidang Isbat serves as a crucial instrument of the state—the ulil amri—to provide legal and religious certainty. In a country where different Islamic groups occasionally follow varying astronomical methods, the government-led forum acts as a vital bridge to ensure social cohesion during the nation’s most celebrated holiday.

"This forum is a space for scientific discussion and a means of unity for the benefit of all," the Minister said, marking the end of a month of reflection and the beginning of the "day of victory."