Synastry House Overlays: Where Their Planets Land
Synastry house overlays show where your partner's planets fall in your chart and which life areas they stir up. Learn how to read them with a grain of salt.
Vela NoorAstral's sky guide · Nov 10, 2026
What house overlays actually are
In synastry, you lay two birth charts side by side. A house overlay asks a simple question: when you place your partner's planets onto your chart wheel, which of your houses do they land in? Each house covers a different part of life, such as money, home, communication, partnership, and work, so the overlay hints at where that person tends to show up in your world. Think of it as a floor plan: their planets are the guests, and your houses are the rooms they wander into.
How to read the rooms and the guests
Start with the planet, then the house. A partner's Moon in your 4th house, the area of home and roots, may feel like instant comfort, as if they belong in your living room. Their Mars in your 3rd house can make conversations lively, quick, and occasionally argumentative. Their Saturn in your 7th house, the house of partnership, can bring a sense of seriousness and commitment, or a feeling of being evaluated, depending on the rest of the chart. Personal planets (Sun, Moon, Mercury, Venus, Mars) tend to be felt most directly, while slower outer planets describe subtler, longer-running themes.
Why it works both ways, and why it isn't a verdict
Overlays are not symmetrical. Your Venus might land in their 10th house while their Venus lands in your 12th, so each of you can experience the connection quite differently. That is why the most useful move is to check both directions and compare notes with each other. Overlays also describe tendencies and themes, not destiny. A tricky placement is a spot to be more mindful, not a sign you should break up, and a glowing one still needs communication and effort to thrive. Consider them alongside aspects between the planets, since the houses show where the energy lands and aspects show how it feels.
What you need to get it right
House overlays depend on accurate birth times for both people, because even a small shift can move a planet into a different house. If one of you does not know your birth time, treat the house readings as loose hints and lean on the planets and signs instead. A birth certificate is usually the most reliable source. Once you have the data, a calculated chart does the sorting for you, so you can spend your energy on the fun part: noticing which rooms of your life this person has already moved into, and how you want to decorate them together.
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