These similar names may actually be spelling or printing errors and possibly refer to the same person. They refer to a legendary hero of Ar who may have been the first man on Gor. He figures into several legends of Ar, including the origin of its Home Stone. Hesius is the name of the second month of the calendar of Ar. Hersius is also the name for the planet Jupiter. The books do not contain the Gorean names of any other planets in our solar system.