Houses & Zodiacs

House systems

Twelve systems are built in: placidus, whole_sign, equal, porphyry, koch, regiomontanus, campanus, alcabitius, morinus, meridian, polich_page, and vehlow. Pass the name as the last argument, or as houseSystem in the options object.

Tropical and sidereal

The default zodiac is tropical. Sidereal modes subtract an ayanamsa:

engine.chart(1990, 6, 10, 14, 30, 0, 27.95, -82.46, {
zodiac: "sidereal:lahiri",
});

Embedded ayanamsas: lahiri, fagan_bradley, krishnamurti, raman, and yukteshwar. Two star-anchored modes (galcent_0sag, true_citra) need the fixed-star catalog from the Node data tier; see Data Tiers.

Angles

Every chart includes the ascendant and midheaven (chart.angles.asc, chart.angles.mc); the vertex and east point are also computed. House cusps are derived by closed-form angles, not iteration.