Porphyry House System and Campanus Houses: What They Mean and Which Planets Move

The Porphyry house system splits each quarter of your chart into three equal parts, while Campanus slices the sky above the birthplace. We compared both with Placidus on 120,000 US charts to see how many planets change houses.
Equal House System in Astrology: Your Midheaven Sits in the 10th Only Half the Time

Equal houses cut the chart into twelve 30-degree rooms from the Ascendant. Our count of 120,000 US charts shows the Midheaven lands in the 9th house as much as in the 10th.
Koch House System Explained: A Practical Guide for Charts

Want a chart method that emphasizes the timing of life events? The Koch House System treats the sky like a clock—using time-based arcs to create variable house cusps—and this practical guide shows how it works, how it differs from other systems, and clear tips for reading Koch houses in everyday chart work.
What Is Placidus in Astrology? The Default House System, Tested on 120,000 US Charts

Placidus is the house system most astrology apps use by default. Here is what it means, where it comes from, and what changes when you switch to whole sign houses, tested on 120,000 US charts.
Whole Sign House System: A Clear Guide to Your Chart

Get a clear, user-friendly walkthrough of the Whole Sign House System that assigns each full zodiac sign to one house so your chart reads like a map of core life themes. Whether youre new to astrology or using charts for practical psychological work, this guide gives step‑by‑step instructions and interpretive patterns to help you practice with confidence.
House Systems Explained: A Practical Guide for Charts

Astrology house systems slice the sky into twelve life-areas, and the system you choose can change where planets fall and what parts of life get highlighted. This practical guide walks you through the main methods, how those shifts affect interpretation, and simple tips to pick the system that fits your charting style.