SB 5.22.9
atha capuryamanabhis ca kalabhir amaranam ksiyamanabhis ca kalabhih pitrnam aho-ratrani purva-
paksapara-paksabhyam vitanvanah sarva-jiva-nivaha-prano jivas caikam ekam naksatram trimsata
muhurtair bhunkte.
Translation by His Divine Grace A. C. Bhaktivedanta Swami Srila Prabhupada:
When the moon is waxing, the illuminating portions of it increase daily, thus creating day for the demigods and night for the pitas. When the moon is waning, however, it causes night for the demigods and day for the pitas. In this way the moon passes through each constellation of stars in thirty muhurtas [an entire day]. The moon is the source of nectarean coolness that influences the growth of food grains, and therefore the moon-god is considered the life of all living entities. He is consequently called Jiva, the chief living being within the universe.