The term horizon has the same meaning in astrology as in other contexts, although in astrological practice it usually refers only to the eastern and western horizons. Extended out into space and projected against the background of the stars, the eastern horizon is referred to as the ascendant, which is the same as the cusp of the first house. Similarly, the western horizon projected against the background of the stars is the descendant, which is also the cusp of the seventh house. A distinction can be made between the tropocentric horizon, which is the horizon from a particular spot on the surface of Earth, and the geocentric horizon, which is a "horizon" created by drawing through the middle of Earth an imaginary line (or great circle) that is parallel to the tropocentric horizon. When extended out into space, the geocentric horizon is called the rational horizon. For most astrological work, the difference between the tropocen-tric horizon and the geocentric horizon is insignificant.
Brau, Jean-Louis, Helen Weaver, and Allan Edmands. Larousse Encyclopedia of Astrology. New
York: New American Library, 1980. Filbey, John, and Peter Filbey. The Astrologer's Companion. Wellingborough, Northamptonshire, UK: Aquarian Press, 1986.
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