About & methodology

Calculate the Sun, Moon and planet positions for a UTC birth date and time. Get a tropical zodiac wheel and downloadable planetary chart, without invented houses.

Purpose

Birth Chart Planet Calculator is an independently operated utility in Elizabeth Knopf’s portfolio. It helps you complete a specific task without an account.

Methodology

Astronomy Engine 2.1.19 computes light-time and aberration-corrected geocentric vectors for the Sun, Moon, Mercury, Venus, Mars, Jupiter, Saturn, Uranus, Neptune and Pluto. Ecliptic converts those vectors to the true ecliptic and equinox of date. Each 30-degree tropical zodiac sector names a sign. A centered one-day longitude difference estimates direct or retrograde motion. Display rounds to 0.01 degrees; rounding is not a claim about birth-time certainty. No latitude, longitude, ascendant, houses or predictive reading is calculated.

Editorial approach

Examples illustrate the tool; they are not testimonials or evidence of guaranteed outcomes. Provider links point to their original websites. Current prices, availability and terms should be verified with those providers. Names of third-party products belong to their respective owners.

Corrections and feedback

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