The Imum Coeli, commonly abbreviated IC, is one of the four principal angles of an astrological chart and is located directly opposite the Midheaven. Its Latin name means “bottom of the sky.” In many House systems, the Imum Coeli forms the cusp of the Fourth House. Astrologers commonly associate it with home, family foundations, ancestry, roots, private life, emotional grounding, and the inner sense of belonging or security. Because its position depends on the specific time and location for which the chart is calculated, an accurate birth time is important when determining it in a natal chart. Its interpretation is usually considered together with its Zodiac Sign, ruling Planet, nearby Planets, Aspects, House relationships, and the broader pattern of the chart.