Regiomontanus Topocentric Birth Chart Calculator

This calculator uses Regiomontanus house system and topocentric coordinate system.

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.

The topocentric system calculates planetary positions relative to the observer's location on Earth's surface, rather than from Earth's center (geocentric). This results in slightly different positions, particularly for the Moon, and is preferred by some astrologers for its physical accuracy.

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