# A B C D E F G H I J K L M N O P Q R S T U V W X Y Z
Astro*Dictionary by Michael Erlewine





3 articles for "Geoarc"

Geoarc [Astro*Index]

Essentially, another word for geocentric house. It is used to emphasize the character of the motion which defines the houses, in this case, the axial rotation of the earth (geo). Compare heliarcs, or houses determined by the sun's conjunction with the intersection of the ecliptic and the horizon (solar houses). This could be done with any of the planets, such that "Mars arc" houses would begin with the conjunction of Mars with the intersection of the ecliptic and the horizon, "Jupiter arc" houses with the conjunction of Jupiter with the same intersection, and so forth. Computer programs today generally allow the user to construct such a chart with an option to align a specific planet with the ascendant. Any of a number of systems are available for defining geoarc houses. For heliarc houses, equal 30-degree segments are measured out beginning with the position of the sun. The same 30-degree scheme holds true for houses oriented to other planets, always beginning the chart with the planet under consideration. The purpose of "arc house" charts is to create a planetary orientation (houses) with reference to a specific body. Once done, planets can be compared according to the houses they reside in depending on the planetary orientation (for example, Uranus in the geoarc first house and the heliarc seventh house). Heliarc houses are the common recourse when the birth time is unknown. The so-called lunar houses align the position of the moon with the intersection of the ecliptic and the meridian in the south (midheaven). Astrologers frequently use solar houses and ascribe specific meanings to planets which in such-and-such a house in relation to the sun. For example, given the sun's position at 10 Cancer and Jupiter's position at 23 Virgo, Jupiter would be said to reside in the solar third house, since the first house begins at 10 Cancer, the second house at 10 Leo, and the third house at 10 Virgo. Jupiter, therefore, with reference to the sun, has a third house quality. With a solar orientation, aspects to the sun would be emphasized. In the above example, Jupiter, by house, is sextile the sun, even though by longitudes the sextile is wide of accepted orbs. "Arc house" technique emphasizes the relationship the signs have with one another and reminds us of how the idea of aspects was formulated by ancient astrology, specifically Ptolemy, who in some key respects regarded houses and signs as synonymous. The house of Jupiter, for example, or Sagittarius, was thought of as trine to the house of Mars, or Aries. It followed that Jupiter and Mars as a pair shared an essential trine quality, regardless how they may be configured in the sky on any given day. A tradition of triplicities stems from this, with the planets associated with the houses trine from any one house considered to be the triplicities of the sign associated with that house. The sun and Jupiter, therefore, as the houses of Leo and Sagittarius, would be the triplicities of Aries, or the house of Mars. The system of triplicities traditionally ascribed to Ptolemy is one of day and night rulership, where for example Aries is said to be ruled by the sun by day and by Jupiter by night, where both planets are associated with signs of a like element. This "elemental integrity," however, is upheld only for the fire signs. Taurus, for example, is ruled by Venus by day but by night the moon, which is exalted in Taurus but associated with a water house (Cancer).

A draconic chart is another variation of "arc house" theme, further removed: it matches the moon's north node with the intersection of the ecliptic and the celestial equator in the east (the vernal point, O degrees Aries), calling that point the beginning of the zodiac, and adjusting the absolute longitudes of the planets by subtracting the longitude of the north lunar node.

See also: ♦ House ♦ Heliarc ♦ Midheaven ♦ Draconic Chart ♦ Vernal Point
Geoarc [DeVore]

A term applied by some modern authorities to one of the house divisions of a map erected for a given moment, when there is under consideration the effect upon an individual, at a given point on the Earth's periphery, of his motion around the Earth's center – in the Earth's daily rotation. The same subdivision of the same map is called a heliarc, when there is under consideration effects based on the actual motions in orbit around the Sun, of all the planets-including the Earth. In other words, Geoarc is synonymous with House, and Heliarc with Solar House, emphasizing the character of the motion to which the subdivisions apply. A geoarc considers the Earth as a rotating body, imparting an appar- ent motion to celestial points and objects. A heliarc views the Earth as a fixed point from which one considers the effects of the actual motions of celestial objects. The heliarcs are 30° arcs measured from the Sun's position on the day for which the Figure is erected.

See also: ♦ House ♦ Heliarc ♦ Midheaven ♦ Draconic Chart ♦ Vernal Point
Geoarc Figure [DeVore]

One in which the cusp of the first Geoarc is the degree rising at a given moment. If the Sun's position becomes the first cusp, it is a Heliarc Figure. However, the subdivisions of either map may be considered either as Geoarcs or Heliarcs, or both.

See also: ♦ Heliarc


Astro*Index Copyright © 1997 Michael Erlewine


[ TOP ]