Angular

The four angles of a chart are the points where the circles that define it cross the ecliptic: the ascendant on the eastern horizon, the descendant opposite it in the west, the midheaven at the culmination, and its opposite below the earth. Greek astrology calls them the kentra, the pivots, and the houses that begin at them are the angular houses, the first, fourth, seventh and tenth.

What the tradition claims for them is strength. A planet in an angle acts with more force and more visibility than the same planet anywhere else, and the strength is understood as a matter of position rather than of dignity. An ill placed planet on an angle does its ill work loudly, and a well placed one in a cadent house may do its good work where nobody notices. The distinction between a planet's essential condition, meaning what it rules and where it is exalted, and its accidental condition, meaning where it falls among the houses, is one of the load bearing distinctions in traditional judgement, and the angular group is the clearest case of the second.

The four are not equal to one another. The tenth and the first are generally counted the strongest, with the seventh and the fourth below them, and authorities order the lower two differently. The ranking matters in practice because a chart usually has several candidates for its strongest planet, and this is what breaks the tie.

The angular houses are also the four most consequential compartments of the house catalogue, and reading their subjects together shows why the tradition treated the group as a unit.

The first is the native: the body, the life, the stature, the character. The fourth is the ground: the parents, the land, the home, the end of the matter, and what lies under a life. The seventh is the other party: the spouse, the partner, the opponent. The tenth is the standing: office, honour, trade, reputation and, in Lilly, the mother. Between them they cover a person, their origin, their significant other and their public position, which is close to a complete account of a life at the scale a chart is asked about.

Two of the four form the axis of the horizon and two the axis of the meridian, and the tradition reads them as different questions. The horizon axis, first and seventh, is the self and the other. The meridian axis, fourth and tenth, is the private ground and the public position. Modern astrology usually calls the second the parental axis and argues about which parent belongs at which end, a dispute recorded elsewhere in this atlas.

A planet on an angle in a chart with an accurate birth time is the strongest single testimony most readings have. The qualification matters. The angles move about a degree every four minutes of clock time, so an angular placement is the part of a chart most sensitive to a wrong birth time, and the tradition developed rectification methods for exactly that reason.

Sources The Daimon in Hellenistic Astrology: Origins and InfluenceDorian Gieseler Greenbaum with Christian AstrologyWilliam Lilly