Whole Sign Topocentric Birth Chart Calculator

This calculator uses Whole Sign house system and topocentric coordinate system.

Whole Sign houses is the oldest house system, used in ancient Hellenistic astrology. Each house occupies one complete zodiac sign (30°), with the sign containing the Ascendant becoming the 1st house. This system is experiencing a revival among traditional astrologers.

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.