About Zodiac Chart

This site exists for one job — a zodiac chart that gives a clear answer quickly and shows how it was reached.

How we test the calculations

Every release of the zodiac chart is checked by an automated test suite of 120 checks in a real browser — normal values, edge cases and invalid input — and on desktop and phone screen sizes before it goes live.

Sources

The formulas and reference values in the guides follow published standards and primary sources, linked where they are used: ssd.jpl.nasa.gov, en.wikipedia.org, spaceplace.nasa.gov.

How we write

Pages are written and maintained by the site's editorial team. We aim to answer the question people actually ask, show worked examples with real numbers, and say plainly where a calculator cannot replace professional advice. Nothing on this site is sponsored content.

Keeping it current

Published October 8, 2026, last reviewed October 12, 2026. Corrections are welcome via the contact page; confirmed fixes go out with the next update.

Advertising

The tool is free to use. The site is funded by advertising, which never influences results or explanations.

— Zodiac Chart editorial team