Zodiac and Houses

The mathematical definition of the Tropical Zodiac, ecliptic coordinates, sign conversion algorithms, and precessional drift.

The mathematical definition of the Sidereal Zodiac, ayanamsha models, polynomial coefficients, and sidereal transformation routines.

Mathematical derivation of the Ascendant, Midheaven, IC, Descendant, Vertex, and East Point from sidereal time and observer latitude.

Mathematical classification of house systems and cusp calculation algorithms for Placidus, Koch, Campanus, Regiomontanus, and others.

Mathematical definition of astrological aspects, orb calculation, applying vs separating, and interpolation for exact aspect timing.