According to Steiner: the portion of the solar system defined by the orbit of Jupiter (if the planets actually orbit the Sun,which Steiner sometimes denied),and the portion of the spiritual realm coterminous with that portion of the physical solar system. It is the home of gods six levels higher than humanity.
"(Hinduism) The light from the sun which is both physical and spiritual...." 80 p. 150[More typically,jyotis is referred to as a form of Hindu astrology.]
