Planetary Center

Chart Structure

Houses Data - Systems, Cusps, and ASC/MC

Houses describe where planetary actions land in a chart. This page explains how we compute house cusps, which systems we support, and how this data appears in the app.

What houses data includes

  • ASC and MC positions.
  • 12 house cusps with degrees and signs.
  • System label and computed timestamp.

How we compute houses

We use your location, timezone, and local time to calculate the ASC/MC and house cusps. The main app uses Placidus for the houses layer.

Supported house systems

  • Placidus (default)
  • Whole Sign

Whole Sign is shown as Whole Sign/Egyptian in the UI.

Ptolemaic and Egyptian terms (bounds)

In Advanced, the dignities layer lets you choose Ptolemaic or Egyptian terms (bounds). These are separate from house systems but often used together.

Where to see it

Enable Advanced and open the Houses data panel to view cusps, ASC, and MC.

Open tools: Hours · Search · Election