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Natal Chart Lab

Free astrology calculators with published methods and astronomical accuracy

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Ahrefs Domain Rating set in type 14 Nov 2026, reset 14 Nov 2026.

A free web application for calculating your Chiron sign, degree, house and return dates using NASA JPL Horizons data, with optional birth time for house

The story so far

Screenshot of the Natal Chart Lab homepage
Homepage of Natal Chart Lab

Natal Chart Lab offers free birth charts and astrology calculators with clear explanations of how results are calculated. The Chiron Calculator helps users find their Chiron sign, degree, and house from their birth date, plus the exact dates of their Chiron return. The calculator uses NASA JPL Horizons' ephemeris data, sampled every 5 days from 1900 to 2100 with spot checks against Horizons agreeing within a fraction of an arcsecond. Birth details are used only to calculate results and are not stored on the site's servers. The site publishes its methodology and handles uncertain birth times by omitting the rising sign and houses when birth time is unknown.

Typeset features

  • Calculate Chiron sign and degree from birth date
  • Optional birth time to determine Chiron house
  • Exact Chiron return dates
  • NASA JPL Horizons ephemeris data
  • Chiron retrograde calendar
  • Birth date range 1900 to 2100
  • Chiron sign interpretations
  • Historical timezone accounting
  • Published methodology and accuracy verification

Pricing

Pricing model: Free

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Natal Chart Lab metrics

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Questions and answers

What is Chiron in astrology?

Chiron is a small icy body orbiting between Saturn and Uranus, discovered in 1977. Astrologers read its sign and house as a lasting sore spot that can become a source of wisdom and help to others.

Do I need my birth time for Chiron?

Not for the sign. Chiron moves at most about 0.1° a day, so your birth date gives the sign and degree. A birth time adds the house, which many astrologers consider the most telling part.

When is the Chiron return?

Around age 50, when Chiron completes its 50-year orbit and returns to its birth position. The calculator gives the exact dates; retrograde loops can make the return exact up to three times within a year.

How long does Chiron stay in a sign?

Between about 1.5 and 9 years. Chiron's orbit is very elongated: it races through Virgo and Libra, where it is closest to the Sun, and lingers for years in Pisces and Aries.

Where is Chiron now?

Chiron is at 27°30′ Aries, retrograde, as of November 14, 2026.

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