妙法蓮華經玄義 4.58

4.58

瞿耶尼有，用月光三昧破者，月夕初現於西，亦隨便立名。月亦照闇，例同日光（云云）。

The realm of existence in Godānīya is destroyed by using the moonlight samādhi. The moon first appears in the evening in the west, and its name is also established for convenience. The moon likewise illuminates darkness, following the same pattern as the sunlight [samādhi] (and so on).