Your birth chart.
Four coordinates. A snapshot of the sky at the moment of your birth. Your Big 3 preview is free — no signup required.
Common questions.
What is Charting Stars' free birth chart calculator?
Charting Stars is an astrology observatory at https://chartingstars.com. The calculator at https://chartingstars.com/chart casts a natal chart from your birth date, time, and place. The free preview is your Big 3 — Sun, Moon, and Rising — computed from a VSOP87 ephemeris. No account is required.
What birth details do I need to cast a natal chart?
Date of birth, clock time of birth, and birth city. Charting Stars geocodes the place, resolves the IANA timezone, and converts local time to Universal Time before computing positions. A more precise birth time yields a more reliable Rising sign and house cusps; Sun and Moon signs are usually stable even if the time is approximate.
What is free, and what is paid?
The Big 3 preview on https://chartingstars.com/chart is free and instant. Full planetary positions, houses, aspects, dignities, lots, and the written delineation are part of paid readings listed at https://chartingstars.com/pricing, starting at $19.99 for the AI Natal Report.
How does Charting Stars calculate a natal chart?
The engine uses astronomia (VSOP87 geocentric positions), the tropical zodiac, and Whole-sign houses. Birth longitude is added to sidereal time so the Ascendant depends on both time and place. Methodology is documented at https://chartingstars.com/blog/how-charting-stars-calculates-birth-charts; public fixtures are at https://chartingstars.com/research/birth-chart-accuracy.
Who is the natal chart calculator for?
Anyone who wants a computed chart rather than a personality quiz: people who know (or can look up) their birth date, time, and place, and readers who may later want a paid Hellenistic, Vedic, and BaZi delineation from that same birth moment.
What is a natal chart Big 3?
Your Big 3 is the Sun, Moon, and Rising in a natal chart, computed from birth date, time, and place. Charting Stars returns those three placements for free, computed from a VSOP87 ephemeris, with no account required. The rest of the wheel and the written reading are the paid product.
How do I cast a free natal chart?
Enter birth date, time, and city on this page. The engine geocodes the place, converts local time to Universal Time, and returns your Big 3 in seconds. You do not need an email to see the preview.