Syzygy
Definition
Syzygy is the technical astronomy name for the configuration in which three celestial bodies (usually the Sun, Earth, and the Moon) sit aligned on a single line or very close to one. The two classical syzygies are the Sun-Moon conjunction, which produces a new moon, and the Sun-Moon opposition, which produces a full moon. Astrology inherits the astronomy word and uses it to name the pure alignment of the luminary pair before a birth.
In context
If the syzygy immediately preceding your birth lands on the degrees of a personal planet in your chart, the reading treats that planet as symbolically charged by the last luminary configuration before the start of your biography. The prenatal syzygy is a classical tool calculated by tracking back to the new moon or full moon just before the consultant was born. Its degree gets noted as an extra sensitive point and is read alongside the Part of Fortune and the nodal axis as a background symbolic layer.
To go deeper
Syzygy belongs to the family of luminary configurations: