Imum Coeli

The Imum Coeli (IC, Latin for "bottom of the sky") is the zodiac degree at the lowest point of the ecliptic at the moment and location of birth — directly opposite the Midheaven. Vettius Valens (Anthology, Book II, Ch. 2, c. 175 CE) described the fourth place as signifying the hidden, underground, and ancestral dimensions of life. William Lilly (Christian Astrology, 1647) associated the fourth house with fathers, land, houses, tenements, inheritances, and the end of life — the private foundations on which existence rests. In the traditional four-angle structure, the IC represents the deepest, most inward point: what lies beneath the public persona. Dane Rudhyar (The Astrological Houses, 1972) described the IC as the roots of consciousness — the psychic bedrock formed by ancestry, family of origin, and the earliest experiences of safety and belonging. Liz Greene (Relating, 1977) characterized planets at the IC as operating in the unconscious foundation of the psyche, often invisible to the native but powerfully influencing behavior and emotional patterns. The IC is the point of maximum privacy. While the MC shows what one achieves publicly, the IC shows what one returns to for nourishment and rest. Planets conjunct the IC describe the fundamental conditions of the inner world and the formative patterns from the family system.