Aspects, Mundane

Mundane aspects are those reckoned along the Equator, and measured in subdivisions of the noctunal or diurnal semi-arc. For example: Any two planets that have a separation of two houses are in mundane Sextile; of four houses, in mundane Trine. Thus it is possible for two planets to be simultaneously in the mutual relationship of a mundane Trine and a zodiacal Square. Mundane aspects can be computed only on a map erected for a birth moment. They represent a computation of coincidental influences on a basis of time, in subdivisions of the Earth’s period of rotation; instead of on a basis of degrees of arc, in subdivisions of the orbits of the bodies involved. Zodiacal Aspects, based on the degree of longitudinal separation along the ecliptic, are computed without reference to an hour of birth, and are the ones commonly employed in delineation.
Because of the alternation of signs of long and short ascension throughout the daily rotation of the Earth, equal units of arc rise of the horizon of an individual on the Earth’s periphery, in disproportionate units of time; and vice versa. This affords one explanation of the phenomenon of the Orbs in reference to Aspects, and suggests that consideration should be given to the seasons at which a wide zodiacal aspect may become an exact mundane aspect.

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