Tropical Koch Birth Chart Calculator

This calculator uses traditional tropical zodiac system and Koch 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 Koch house system, developed by Walter Koch, is a quadrant system that divides houses based on the great circles through the east point and the MC. It is popular in German-speaking countries and among some modern astrologers for its focus on individual birth time accuracy.

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