True Sidereal Chart Calculator

This calculator uses the actual constellations in the sky.

It uses the midpoint between constellations as the sign boundaries. This is different from other forms of sidereal astrology. For example, Vedic and IAU do not use the true size of the constellations along the ecliptic. This calculator is essentially a planetarium in astrology chart form.

Accurate within 1 degree for birth dates within the past 100 years.

New to true sidereal astrology?

To read your chart: Chart Key | How to Read a Birth Chart

Or simply order your True Sidereal Chart Report