佛祖統紀 31.11

31.11

長阿含經。一日月行四天下為一世界。如是千日月。千須彌。千閻羅王。千忉利。千梵天。千鐵圍。名為小千。即數小千至滿一千。名為中千（即是百萬亦稱十億）即數中千復滿一千。名為大千（即是千萬萬亦稱萬億）其中須彌山王。四洲日月。乃至梵天。各有萬億（光明云百億須彌者億有四等。一十萬為億大千則當萬億。二百萬為億大千則當千億。三千萬為億大千則有百億。四萬萬為億大千則有十億。今言百億是第三之數。然此方以十萬為億為正數）成則同成。壞則同壞。皆是一佛化境。號為娑婆世界（梵語娑婆此云堪忍）。

The Dīrghāgama says: One sun and moon traversing four under-heavens constitute one world. A thousand such suns and moons, a thousand Sumerus, a thousand Yama Kings, a thousand Trāyastriṃśa [heavens], a thousand Brahmā heavens, and a thousand Iron Ring [mountains] are called a small-thousand [world]. Counting small-thousand [worlds] until reaching a full thousand is called a medium-thousand [world] (that is, one million, also called ten billion). Counting medium-thousand [worlds] until reaching again a full thousand is called a great-thousand [world] (that is, ten thousand times ten thousand, also called a myriad billion). Within it, Mount Sumerus the kings of mountains, four-continent suns and moons, and on up to Brahmā heavens, each number a myriad billion. (The *Suvarṇaprabhāsa* says "ten billion Sumerus" because there are four classes of *yi* [billion/hundred thousand]: first, one hundred thousand as an *yi*, then a great-thousand corresponds to a myriad billion; second, one million as an *yi*, then a great-thousand corresponds to a thousand billion; third, ten million as an *yi*, then a great-thousand has a hundred billion; fourth, one hundred million as an *yi*, then a great-thousand has ten billion. Here the mention of a hundred billion is the third numbering. However, this land takes one hundred thousand as an *yi* to be the correct reckoning.) They form together and disintegrate together, all being the transformation realm of one Buddha, named the Sahā World (the Sanskrit *Sahā* is translated here as "endurance").