Placidus Topocentric Birth Chart Calculator

This calculator uses Placidus house system and topocentric coordinate system.

The Placidus house system is the most widely used house system in Western astrology. It divides the ecliptic based on time rather than space, creating houses of unequal size that reflect the natural rhythm of the Earth's rotation. This system is particularly effective for psychological and character analysis.

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.