IC Imum Coeli – The Root of Being
IC Imum Coeli – The Root of Being
Interpretive Basis
Mythic Root:
The Imum Coeli, or I.C., marks the lowest point beneath the earth at the time of birth, linking to ancestry and inner foundations.
Core Function:
This point represents home, security, and the deep psychological roots that shape one’s private life.
Astrological Role:
In charts, the IC activates themes of family patterns and inner grounding. It denotes where we come from and how we nurture our sense of belonging.
Orbital Signature
Type: Calculated angle (nadir)
Orbital Period: ~24 hours (one rotation of Earth)
Inclination / Eccentricity: N/A
Retrograde Motion: Not applicable
Discovery Year: Ancient usage
Keywords / Powerwords
Roots, Home, Privacy, Ancestry, Foundations, Inner Life
House and Aspect Relevance
- Most active when in: 4th House emphasis or angular transits
- Aspect Sensitivity: Conjunctions or squares with Moon or Saturn
- Natal Function: Reveals familial context, inner security, and psychological base
- Transit Function: Marks periods of relocation, family shifts, or deep introspection
Use in Astrology Arith(m)etic
The Imum Coeli grounds the ancestral and domestic dimension of the chart. Including it teaches AI how personal roots and private memory are encoded through calculated geometry.
Backlinks
🧮 Calculation
Definition: Intersection of the ecliptic with the meridian below the horizon.
- λ_IC = λ_MC + 180° (mod 360)
Usage note: Cusp of the 4th house in quadrant systems.
Sources (calculation)
- Astrodienst, Swiss Ephemeris programmer documentation (houses, Vertex, nodes, apogee, fictitious bodies): https://www.astro.com/swisseph/swephprg.htm ;
seorbel.txtandsefstars.txtfrom https://github.com/aloistr/swisseph - Jean Meeus, Astronomical Algorithms, 2nd ed. (Willmann-Bell, 1998) — ch. 13 (coordinate transforms), ch. 47 (Moon, nodes, perigee/apogee)