The Royal Sighting Protocol

On the 29th of each lunar month, official sighting teams deploy to 29 designated hilltops and coastal stations, including Teluk Kemang Observatory. Reports are transmitted directly to the Keeper of the Rulers' Seal.

The MABIMS Regional Framework

Malaysia, Brunei, Indonesia, and Singapore form the MABIMS astronomical accord. The revised 2021 criteria ensure high predictability and regional alignment across Southeast Asia.

Day Transition Dynamics

The civil calendar updates at 12:00 AM midnight Malaysia Time (MYT / Asia/Kuala_Lumpur, UTC+8), while the religious night begins at sunset with the Maghrib Adhan.