House

The twelve houses are the arc-shaped sectors dividing the birth chart wheel, numbered 1 through 12 counterclockwise from the Ascendant. Each house represents a different sphere of life — the first governs the self and body, the second personal resources, the third communication and siblings, the fourth home and family, and so on through the twelfth house of hidden matters and spiritual retreat. William Lilly (Christian Astrology, 1647) described the twelve houses as the essential framework for interpreting any question — every matter of life falls under one of these domains, and the planet ruling that house's cusp becomes its significator. Lilly's house descriptions remain foundational in both classical and modern practice. Dane Rudhyar (The Astrological Houses, 1972) reframed the houses as fields of experience rather than fixed departments: they show the context in which archetypal drives meet concrete life. The house a planet occupies describes WHERE in life its function operates, while the sign describes HOW. Different house systems — Placidus, Equal, Whole Sign, Koch — calculate house boundaries differently. Whole Sign houses, used by Valens and the Hellenistic tradition, assign each sign an entire house from 0° to 30°. Modern Placidus, developed in the 17th century, uses the degree of the Midheaven and Ascendant as division points, producing unequal houses. Planets in angular houses (1, 4, 7, 10) carry maximum visibility and worldly effect; succedent houses (2, 5, 8, 11) support resources; cadent houses (3, 6, 9, 12) govern learning and hidden processes.