Ambient

That which moves. A term loosely applied to the heavens. Milton speaks of the ambient air; Pope of ambient clouds. Ptolemy used it to describe the tenth sphere that by its compelling force moved all other spheres with it from the East across the heavens. Since Copernicus exploded this concept, the modern astrologer is free to apply this excellent term to the Earth’s surrounding magnetic field as varyingly charged by virtue of the cycles of the planets, the Sunspot cycle, and other cosmic phenomena.

DeVore, Nicholas. Encyclopedia of Astrology. New York: Philosophical Library, 1947.