Planet Yomon is a rocky planet about three and a half times the size of Earth that revolves around two stars. It has five moons: Eamon, Beid, Keid, Erdrogany, and Elrakis. The Yomonian calendar has a day roughly correspond to one degree of rotation around its two suns. As such, there are almost no leap years, but once in a very long while, there will be a thirteenth month consisting of a week to offset the roughness of the calendar.

Planet Yomon is where The Voices of the Forest and Snake, Vulture, Axle take place.