Helios's sister, Selene, absorbs the reflected rays of the sun, suppressing her ability to think and remember, entering a state of disorientation; apathy; detachment; heightened emotionality and vivid dreaming. This extremely thorough proving discusses the astrology, mythology, symbolism and natural cycles of the moon; compares it with Clarke's version, and discusses the personality type Luna might benefit. The proving was conducted around the same time as her brother proving, Sol.

Sold as advertised - copies may have a small amount of sun-damage (fading) on the cover.