Ancient storytellers observed that the sun makes a journey every night. To their eyes, the sun slipped out of sight in the western sky and descended into the dark earth or ocean, only to reappear far to the east at dawn. The old ones watched this daytime voyage of light across the sky. They understood that the sun’s light inspired the process of photosynthesis. It warmed the desert and opened the flowers. But at night, when the sun descended into the dark, they understood that even more was taking place. Do we make this same journey? Is that what this is all about? What waits in the dark?

— from the book Stars at Night: When Darkness Unfolds As Light