The IAC Moon Sighting Framework
Headquartered in Beijing, the IAC convenes senior imams from historic institutions like the Niujie Mosque alongside regional associations in Xinjiang, Gansu, and Ningxia on the 29th of each lunar month.
The Sino-Islamic Astronomical Legacy
Muslims in China possess an extraordinary tradition of mathematical astronomy, pioneered by figures like Jamal al-Din in the 13th century. Today, modern celestial tables are paired with local observation reports across the vast Chinese territory.
Day Transition Dynamics
The civil calendar updates at 12:00 AM midnight China Standard Time (CST / Asia/Shanghai, UTC+8), while the religious night begins at sunset with the Maghrib prayer.