Tropical Regiomontanus Birth Chart Calculator

This calculator uses traditional tropical zodiac system and Regiomontanus house system.

The tropical zodiac is based on the seasons and the position of the Sun at the spring equinox. This is the system used by most Western astrologers. Each sign is exactly 30 degrees, starting with Aries at the spring equinox (March 20-21).

The Regiomontanus house system, named after 15th-century astronomer Johannes Müller (Regiomontanus), is a space-based quadrant system. It is popular among Renaissance and traditional astrologers and is known for its mathematical elegance.

For more features including saving charts, transit charts, synastry charts, and more settings please use True Sky online astrology software.