THE NATIONAL RESEARCH AND INNOVATION AGENCY
BRIN Researchers Reveal Potential Differences on Eid Al-Adha
The National Research and Innovation Agency (BRIN) predicts that the Eid al-Adha Day 1443 H this year has the potential to be different. This is because there are two main criteria used in Indonesia to determine the day, i.e the Criterion of Wujudul Hilal and the New Criterion, MABIMS.
Jakarta, 7 June 2022. The Eid al-Adha 1443 H has the potential to be different. This difference is due to two main criteria used in Indonesia. Research professor of Astronomy-Astrophysics of the National Research and Innovation Agency (BRIN), Thomas Djamaluddin said that the Eid al-Adha this time has the potential to fall on different dates, namely on 9 July and 10 July 2022.
“There are two main criteria used in Indonesia, i.e., the Criterion of Wujudul Hilal and the New Criterion of MABIMS. The criterion of Wujudul Hilal used by the Muhammadiyah is based on the condition of the moon setting later than the sun.” explained Thomas.
While the new criterion, MABIMS, Thomas explained further, is based on the minimum limit for the sighting of crescent moon or hilal (imkan rukyat or the visibility of the hilal), namely the physical hilal expressed in the elongation parameter (moon-sun angular distance) of minimum 6.4 degrees, and the physical disturbance of syafak (twilight) light expressed in the altitude parameter of minimum 3 degrees. The new criterion MABIMS is used by the Ministry of Religious Affairs and several Islamic organizations.
This potential difference can be explained using the analysis of date line, as shown in the image below:
The date line of Wujudul Hilal (between the red and white shading in above image) crosses the south of Indonesia. Meanwhile, the date line of MABIMS New Criterion (between the green and red shading, bottom image) crosses far to the west of Indonesia.
“By Maghrib time – dusk, 29 June 2022, in Indonesia the position of the moon is already above the horizon. This means that the criterion of Wujudul Hilal has been met. That is why the Muhammadiyah in its edict states that 1 Dzulhijjah 1443 falls on 30 June 2022, and the Eid al-Adha will fall on 9 July 2022. Meanwhile, the national holidays which indicate that the Eid al-adha 1443 will fall on 9 July 2022 is still based on the old criterion of MABIMS, namely a minimum height of 2 degrees and elongation of 3 degrees or the age of the moon of 8 hours,” explained Thomas.
“This is because the agenda of national holidays still follow the Joint Decree (SKB) which was stipulated in 2021, while, the MABIMS criterion has just been set in 2022,” continued Thomas.
Thomas explained that when referring to the date line of MABIMS New Criterion, it shows that in Indonesia at sunset on 20 June 2022, the height of the moon is generally less than 3 degrees and the elongation is less than 6.4 degrees.
“This means that the hilal is too thin to be able to beat the light of syafak which is still quite strong. As a result, it is impossible for the hilal to be observed. Under the calculation of imkan rukyat (hilal visibility), the data shows that 1 Dzulhijjah 1443 will fall on 1 July 2022 and the Eid al-Adha will fall on 10 July 2022,” he added. “Confirmation by observation will be made on 29 June and it will be decided at the initial itsbat session of Dzulhijjah 1443, the time of which will be further informed by the Ministry of Religious Affairs.” Thomas concluded.