Cross of Matter
Definition
The 'Cross of Matter' (also called 'tree of life' in Clare Martin's vocabulary) is the four-angle cross of the birth chart formed by the horizontal Ascendant–Descendant axis intersecting the vertical Midheaven–Imum Coeli axis. Martin frames the chart's incarnational structure through this image: at birth, the disembodied universal pattern of planets-and-signs is 'quartered, nailed, as it were, to the cross of matter' — the two major axes that fix the chart into specific time and place. The metaphor draws on Christian-alchemical iconography in which the cross within the circle is the ancient symbol for the Earth.
In Tradition
In the psychological-astrology lineage running from Jung through CPA (the Centre for Psychological Astrology) and Clare Martin, the Cross of Matter is read as the chart's structural backbone: the horizontal axis reaches outward to connect us with the world; the vertical axis provides central stability — 'our root system from which we draw the strength to grow tall in the world.' The four angles together are read as the incarnational frame within which the rest of the chart enacts.
In Practice
Practitioners working in the psychological lineage read the angles as the cardinal coordinates of the embodied self: Ascendant (Mars-pole, the appearing 'me'), Descendant (Venus-pole, the not-me encountered through relationship), MC (Saturn-pole, world-engagement and vocation), IC (Moon-pole, ancestral roots and the inner home). Planets aspecting any angle are read as biographical pressure-points where the chart 'lands' most concretely. Martin's natural-zodiac orientation pairs the four angles with their archetypal sign correspondences (MC/Capricorn, ASC/Aries, DES/Libra, IC/Cancer) to anchor the cross-of-matter framework in the elemental quaternity (earth/fire/air/water).
Historical Origin
The cross-within-the-circle as an emblem of Earth is an ancient symbol attested across Christian-alchemical and esoteric literatures. Clare Martin's Mapping the Psyche Vol 2 (CPA Press 2007 / 2016) gives the 'cross of matter' formulation in its modern psychological-astrology sense, drawing the metaphor through CPA-lineage Jungian pedagogy. The angles themselves are foundational to Hellenistic horoscopic astrology — attested in Firmicus Maternus's Mathesis Book II — but the 'cross of matter' label is a modern psychological reframing.
Further Reading
- Clare Martin, Mapping the Psyche Volume 2
- Howard Sasportas, The Twelve Houses
- Liz Greene, The Astrology of Fate