A birth chart or natal chart (horoscope) is a geometrical portrait of the heavens from the perspective of the Earth at the moment of an individual’s birth.
Tarnas provides the canonical depth-psychological definition of the natal horoscope as a spatially precise celestial portrait encoding the archetypal dynamics present at birth, which the individual then creatively unfolds across a lifetime.
, Cosmos and Psyche: Intimations of a New World View, 2006thesis