觀無量壽佛經疏 3.7

3.7

答曰：「此有三意。一者欲令眾生識境住心，指方有在。不取冬夏兩時，唯取春秋二際。其日正東出，直西沒。彌陀佛國，當日沒處，直西超過十萬億剎即是。

Answer: "This has three intentions. First, he wished to cause sentient beings to recognize the object and steady their minds, pointing toward a specific direction. He does not take the two seasons of winter and summer, but takes only the two intervals of spring and autumn. [At these times,] the sun rises due east and sets due west. Amitābha's Buddha-land is due west, exceeding a hundred thousand koṭis of lands past the place where the sun sets.