Local time + UTC offset, no timezone/DST lookup — enter the offset that was in effect at birth. Positions come from an in-browser ephemeris (astronomy-engine), accurate to a few arcseconds. Placidus houses are computed from scratch and checked against Swiss Ephemeris. Chiron is computed by numerically integrating a JPL-verified orbit (epoch JD 2461200.5) under Sun + Jupiter + Saturn + Uranus + Neptune gravity — accuracy is best near that epoch and degrades gradually further out; non-gravitational (outgassing) effects aren't modeled. City search covers ~24,000 places worldwide (population 15,000+) bundled with the page — nothing is sent anywhere when you type. City data © GeoNames.org, CC BY 4.0.
Ascendant fixed to the left horizon · green = Asc · cyan = MC
Every chart point plotted against the real stars, ecliptic band running through center. Scroll/drag/pinch to explore.
Star field, constellations, and Milky Way band © d3-celestial, Olaf Frohn, BSD-3-Clause.