as·tron·o·my
/əˈstrɒn.ə.mi/
Astronomy in the context of astrology refers to the mathematical and observational foundations underlying astrological practice. It involves understanding celestial mechanics, coordinate systems, planetary motions, timekeeping, and the geometry of the heavens.
These concepts are essential for accurate chart construction and interpretation. While not interpretive on their own, astronomical knowledge grounds astrology in observable celestial phenomena, ensuring technical precision in everything from house division to planetary positions.