AstroChart is a web-based astrocartography calculator for examining how birth-chart planetary lines correspond to locations around the world. Users enter an optional name, birth date, birth time, birth location, timezone, or manual coordinates. The calculator generates a map showing where planets cross the Midheaven, Imum Coeli, Ascendant, and Descendant angles. Users can select which planetary lines to display, view influences associated with career, home, identity, relationships, and personal development, and click locations for detailed interpretations. The service uses Swiss Ephemeris DE431 for planetary position calculations and also provides current planetary positions. Results are intended for entertainment and self-exploration, not as professional advice for major decisions.