Indonesia Sets May 17, 2026, for Isbat Session to Determine Eid al-Adha Date

Indonesia, a nation with the world's largest Muslim population, is preparing for the upcoming Eid al-Adha celebrations with the Ministry of Religious Affairs scheduling a crucial 'isbat' session for May 17, 2026. This formal meeting is the cornerstone of the government's mechanism for officially determining the beginning of Islamic months, including Dzulhijjah, which dictates the date of the major pilgrimage and Eid al-Adha.

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The isbat session is a deliberative forum bringing together the government, Islamic organizations, and experts in astronomy and falak to determine the beginning of the Hijri month.

The isbat session is a unique Indonesian tradition, bringing together government officials, representatives from prominent Islamic organizations, and experts in astronomy and 'falak' (Islamic astronomy). This collaborative approach, integrating scientific calculations ('hisab') with direct observation of the new moon ('rukyat'), ensures that the final decision is both scientifically grounded and ritually compliant. The Ministry emphasizes that this dual method provides a comprehensive and authoritative basis for the calendar.

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The process of determining the start of Dzulhijjah integrates the hisab method (astronomical calculation) with rukyat (crescent moon observation). These two approaches complement one another to produce a comprehensive and authoritative decision.

During the session, preliminary astronomical data will be presented, indicating that the new moon's position on the 29th of Dzulkaidah 1447 Hijri theoretically meets the MABIMS visibility criteria. However, officials are quick to stress that these are predictive figures. The final, official determination of Dzulhijjah's start hinges entirely on the results of the 'rukyatul hilal' (crescent moon sighting) conducted across various observation points nationwide and the subsequent deliberation during the isbat session.

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This approach ensures that the decision is not only rooted in scientific data but is also confirmed through field observations.

This meticulous process underscores Indonesia's commitment to religious accuracy and communal consensus. While international astronomical data might suggest a date, Indonesia's approach prioritizes local observation and a unified national decision. The public is urged to await the official announcement following the May 17th session, ensuring that all Muslims in Indonesia celebrate Eid al-Adha together, reflecting the nation's strong sense of religious unity and adherence to established procedures.

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The official start of Dzulhijjah still awaits the results of the observation and the final decision of the isbat session as the state’s official authority.