Astrology Placidus Chart Generator
Discover your cosmic blueprint with a personalized birth chart using Placidus or Whole Sign house systems
Astrology Placidus Chart Generator Examples
See what others have created
How to Get Started
Simple steps to create amazing results
Enter Birth Details
Provide your birth date, exact time, and location to ensure accurate planetary positions and house placements in your Placidus chart.
Customize Your Chart
Choose your preferred house system, aspect lines, color scheme, and which celestial bodies to include in your personalized astrology chart.
Download & Interpret
Generate your high-resolution Placidus chart image instantly and download it for study, sharing, or printing your complete natal chart.
Main Features
Powerful capabilities at your fingertips
Precise Placidus Calculations
Generate accurate astrology charts using the time-tested Placidus house system with precise planetary positions based on your exact birth data.
Customizable Chart Design
Personalize your chart's appearance with various color schemes, aspect line options, and the ability to show or hide specific celestial bodies.
High-Quality Image Export
Download your Placidus chart as a high-resolution image file, perfect for printing, sharing with astrologers, or keeping in your records.
Multiple House Systems
Switch between Placidus and Whole Sign house systems to compare different astrological interpretations of your birth chart.
Unlimited Chart Generation
Create as many astrology charts as you need for yourself, family, friends, or clients without any restrictions or limitations.
Professional Quality
Generate astrologer-grade charts with accurate astronomical data, aspect calculations, and professional formatting suitable for serious study.
Interesting Things You Might Not Know About Astrology Placidus Chart
17th Century Origins
The Placidus house system was developed by Italian monk and mathematician Placidus de Titis in 1688, making it over 335 years old and one of the most enduring astrological calculation methods still in use today.
Most Popular System Worldwide
Approximately 70-80% of Western astrologers use the Placidus system as their primary house division method, making it the dominant system in modern astrology despite dozens of alternatives existing.
Time-Based Mathematics
Placidus calculations are based on the time it takes for celestial bodies to rise above the horizon, dividing each quadrant into three equal temporal segments rather than spatial divisions.
Polar Region Problem
The Placidus system mathematically fails in locations above 66°33' latitude (Arctic and Antarctic circles) where the sun doesn't rise or set for extended periods, making it impossible to calculate house cusps during certain times of year.
Not Actually Invented by Placidus
Despite its name, the mathematical foundation was actually developed earlier by Giovanni Antonio Magini in 1598, but Placidus de Titis popularized and refined the system nearly a century later.
Unequal House Sizes
Unlike equal house systems, Placidus houses can vary dramatically in size, sometimes spanning as little as 15 degrees or as much as 60 degrees depending on birth latitude and time.
Medieval Roots
The mathematical principles behind Placidus are derived from the ancient concept of 'semi-arc' systems used by Ptolemy around 150 CE, connecting it to astrological practices nearly 2,000 years old.
Default Computer Setting
Since the 1980s, most astrological software programs have used Placidus as their default house system, significantly contributing to its widespread adoption among contemporary astrologers.
Complex Trigonometry Required
Calculating a Placidus chart manually requires solving spherical trigonometry equations involving right ascension, oblique ascension, and declination—a process that can take 30-45 minutes per chart without computers.
MC and IC Precision
The Placidus system shares identical Midheaven (MC) and Imum Coeli (IC) points with most other house systems, but differs significantly in the calculation of intermediate house cusps 2, 3, 5, 6, 8, 9, 11, and 12.
Diurnal vs Nocturnal Arc
Placidus uniquely considers whether a planet is above or below the horizon, using different mathematical formulas for diurnal (day) and nocturnal (night) arcs to determine house positions.
Intercepted Signs Phenomenon
The Placidus system frequently creates 'intercepted signs'—entire zodiac signs contained within a single house without touching its cusps—occurring in approximately 30-40% of charts for births at mid to high latitudes.
Frequently Asked Questions
Everything you need to know
Ready to Discover Your Cosmic Blueprint?
Generate your personalized Placidus astrology chart in seconds and unlock the wisdom of the stars.