KUALA LUMPUR, March 30 -- High above the city at KL Tower, officials from the Federal Territory Mufti's Office stood ready, their eyes fixed on the horizon, awaiting the sliver of light that would determine the end of Ramadan.

The task before them was as old as Islam itself: spotting the new moon, or anak bulan, which would decide whether Malaysians would celebrate Hari Raya Aidilfitri on Monday or fast for one more day.

Earlier in the evening, rain had fallen steadily from 5pm before easing about an hour later, leaving behind a cloudy sky tinged with haze, which added to the challenge of the sighting.

The evening's proceedings began with a solemn recitation of Surah Yasin, followed by prayers joined by all attendees - a customary prac...