俱舍論疏 11.12

11.12

論「二輪廣量至踰繕那」，此明水、金二輪廣量。准此，金、水二輪與風輪不同，風輪無數，理合大千同一。「二徑十二億」等，即是唯一四天下也。略計八山、七海已六十萬餘踰繕那，更加外海、輪圍亦有十二億。下文云十萬為洛叉，故知十萬為億也。有人謂十二餘億為大千之徑。全不相當。《婆娑》一百三十四「風輪廣則無數。」又云「如是水輪於未凝結位，深十一億二萬踰繕那。有說廣量與風輪等。有說狹小分百俱胝，百俱胝輪其量皆等，謂徑十二億三千四百半，圍量三倍，謂三十六億一萬三百五十踰繕那。有說：金輪廣如水量。有師復說：少廣水輪。」准此論釋，風、水之中取其後說。水、金之內今取前師。今詳前之二說、前說為善。既同一雨水以成水輪、於中何要分金、水別？又三輪相依，風輪既等大千，水、金因何即小？

On the passage in the treatise from "The breadth and measure of the two discs" to "yojanas": this clarifies the breadth and measure of the water and gold discs. Based on this, the gold and water discs are different from the wind disc; the wind disc is immeasurable, and in principle must be shared by the entire trichiliocosm. "The two diameters are one billion two hundred million..." and so forth refers specifically to a single world of four continents. Roughly calculating the eight mountains and seven oceans already yields over six hundred thousand yojanas; adding the outer ocean and the Cakravāḍa iron rim, there is indeed one billion two hundred million. A passage below says that a hundred thousand is a lakṣa, so we know that a hundred thousand is an "亿" (koṭi/lakṣa). Some people claim that one billion two hundred million and more is the diameter of the trichiliocosm. That does not correspond at all. Fascicle 134 of the Vibhāṣā says: "The breadth of the wind disc is immeasurable." It also says: "Such a water disc, in the state before it congeals, is one billion one hundred twenty thousand yojanas deep. Some say its breadth and measure are equal to the wind disc. Some say it is narrow and small, divided into a hundred koṭis; the measures of the hundred koṭi discs are all equal, namely, the diameter is one billion two hundred million three thousand four hundred and a half, and the circumference is threefold, namely, three billion six hundred ten thousand three hundred and fifty yojanas. Some say: the gold disc is as broad as the measure of water. Another master again says: it is slightly broader than the water disc." According to the explanations in this treatise, between wind and water, it adopts the latter explanation. Between water and gold, it now adopts the former master. Examining the two explanations above now, the former explanation is better: since it is the same rain water that forms the water disc, why would one need to separate gold and water? Furthermore, the three discs support each other; since the wind disc is equal to the trichiliocosm, why then would water and gold be small?