Meaning and Notation

The Vertex is one of a number of calculated points introduced into twentieth-century Western astrology to supplement the classical angles. It is a geometric construction rather than a visible body, and unlike the lunar nodes or the Part of Fortune it carries no pre-modern documentary history at all, since its underlying geometry, the prime vertical, only became a routine tool of chart calculation once spherical astronomy was applied systematically to natal charts in the Johndro-Jayne research of the 1930s through 1950s.

Partly for this reason the Vertex never acquired a single glyph with anything like the universal recognition of the older planetary and asteroid symbols; software and printed ephemerides commonly abbreviate it simply as Vx, with AVx for the Antivertex, rather than drawing a dedicated pictorial mark, a plain notational habit that reflects the point's comparatively narrow and recent adoption even within contemporary astrological practice. Where the four asteroids and the lunar nodes each carry glyphs that trace back through nineteenth-century astronomy or medieval and ancient manuscript traditions respectively, the Vertex illustrates the opposite case, a chart factor whose entire documented history sits within living astrological memory, described in the technical vocabulary of early twentieth-century American astrology rather than inherited from any older source.