23+ House Systems for Professional Chart Analysis

Here's the deal: house systems determine WHERE planets fall in your chart, which changes everything.

In Placidus houses, your Mars might be in the 7th house of relationships.

Switch to Whole Sign, and suddenly it's in the 8th house of transformation.

Same planet, different meaning.

Professional astrologers use multiple systems because: (1) Ancient techniques work better with traditional houses, (2) Modern psychology fits better with modern systems, (3) Different systems highlight different life themes.

It's like having multiple camera lenses - wide angle shows the big picture, zoom lens shows details.

Our API calculates all 23+ systems instantly, so your users can explore different perspectives on their chart.

Placidus is what most people know - houses have different sizes based on birth location and time.

If you're born in Alaska, your houses look stretched compared to someone born in Florida.

It's mathematically complex but feels "personal" because it uses your exact coordinates.

Whole Sign is simpler - each house is exactly 30 degrees, starting from your rising sign.

Ancient astrologers used it because it's clean and consistent.

Modern research shows Whole Sign works better for timing techniques and life periods, while Placidus excels for psychological analysis.

Professional software needs both.

Our API switches between them instantly, so astrologers can compare interpretations side-by-side.

Integration is surprisingly simple - one API call returns all house systems simultaneously.

Send birth data, get back cusp positions for Placidus, Equal, Whole Sign, Koch, Regiomontanus, Campanus, and 17+ others.

Most developers implement it as a dropdown menu: "View in: Placidus | Whole Sign | Equal" etc.

Advanced users love this flexibility.

Implementation takes about 30 minutes: (1) One API call gets all systems, (2) Frontend switches between them, (3) UI updates house positions automatically.

We handle all the complex math - great circles, oblique ascension, prime vertical calculations.

You just pick which system to display.

Different astrological traditions use different house systems, and pros need to speak all languages.

Hellenistic astrology requires Whole Sign houses.

Medieval techniques work best with Regiomontanus.

Indian astrology uses Equal houses.

Modern psychological astrology prefers Placidus.

It's like being a translator - you need to understand multiple dialects of the same language.

Plus, research shows different systems excel at different prediction methods.

Whole Sign is better for annual profections.

Placidus works great for progressions.

Equal houses shine in electional astrology.

Our API serves the professional market where accuracy and tradition matter.

House system calculations are pure mathematics - there's no room for interpretation, only precision.

We use Swiss Ephemeris data (same as NASA JPL) with 0.001° accuracy.

That means if we calculate your Midheaven at 15°23'45" Gemini, it's mathematically correct to the arc-second.

Why does this matter? Because house cusps determine planet placement.

Being off by even 30 arc-minutes could put a planet in the wrong house entirely.

Some free calculators use simplified math and can be wrong by several degrees.

Professional astrologers can't afford that kind of error.

Our calculations match SOTA astrology software like Solar Fire, Kepler, and Sirius exactly.

Each house system shines in specific contexts.

Whole Sign dominates ancient techniques: profections, zodiacal releasing, Hellenistic timing methods.

The math is cleaner and the results more consistent.

Equal houses excel in horary (question astrology) and electional work because they treat all houses equally.

Placidus works best for psychological analysis and modern transit work because the unequal houses reflect life's natural imbalances.

Koch (Birthplace) handles extreme latitudes better than Placidus.

Topocentric claims greater astronomical accuracy.

Professional astrologers choose systems based on technique, not personal preference.

Our API supports this flexibility by calculating everything simultaneously.