Relationship astrology › House overlay calculator

WESTERN ASTROLOGY · TWO BIRTH CHARTS

Synastry House Overlay Calculator

See where each person’s planets fall in the other person’s houses, with both directions kept distinct.

STAR & SIGIL

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A house overlay asks a narrower question than an aspect comparison. Person A’s planet is located in Person B’s house grid, then the calculation is reversed. The same two birth records can give different house numbers in each direction.

These fictional example records both use Greenwich and UTC. Replace them with recorded dates, times, historical offsets, and coordinates. A recalled or rounded hour can move a cusp; do not invent an hour when it is unknown.

Person A
Person B

What the table means

Each row gives the tropical degree for a planet and a house number in the other person's chart. “A in B’s house” reads Person A’s planet against Person B’s Ascendant and selected house frame. “B in A’s house” reverses the roles. The columns are not interchangeable. The place and historical UTC offset matter because the receiving person's Ascendant changes with the local sky.

Whole Sign starts house one at the beginning of the rising sign. Equal House starts house one at the exact Ascendant degree and divides the zodiac into twelve 30° sectors. A planet may therefore change house when you change method; the underlying planet longitude does not change. Use the house-system comparison to explore more cusp methods for one chart.

This table organizes a traditional symbolic reading. It does not tell you how another person feels, prove compatibility, or replace a conversation. Read the house-overlay method and worked example →