The full moon in May is the occasion of the greatest festival of the year in the Buddhist world, it being the triple anniversary of the birth of Sakyamuni, of his ascent to the omniscience of a Buddha, and of his final extinction in Parinirvana. Ceylon and the countries of southeast Asia, which adopted the Singhalese Buddhism in the thirteenth century—Burma, Thailand, Cambodia, and Laos—are monsoon lands where the month of May coincides with the beginnings of the rains, thus signaling great rejoicing exemplified by offerings to the monks, recitals of prayers, and nocturnal circumambulations of the temples by the faithful torchbearers.