What does a partner's planet in the 4th house mean?

They end up inside the part of your life outsiders do not see. The house covers home, family and the private self.

How common is a 4th house overlay?

One planet has a 8.33% chance of landing there. Across nine planets, 54.3% of random pairs have at least one, and 16.9% have two or more. This is arithmetic, not compatibility.

How much does birth time matter here?

Completely. Two hours of error moves the whole house grid by one house, so an unverified birth time turns this reading into the one for the house next door.

4th House Synastry Overlay: Meaning and How Common It Is

What this house covers, and how often it fills

Area of life home, family and the private self

Natural sign Cancer, ruled by Moon

Opposite house 10 — public standing and direction of work

House type angular

Demand 7,510/mo · rank 6 of 12

This house pairs with the 10th across the chart — public standing and direction of work — and the two work as one axis. A planet landing here is also, by definition, opposing whatever sits there, so the two readings belong together rather than separately.

It is a angular house, which sits on an axis of the chart, so it is the group most distorted by an inexact birth time. Its natural ruler is Moon, so a partner's moon arriving here doubles the theme rather than adding a new one.

Base rates for any overlay →

Being angular, it shifts first when the birth time is off. How much →

The 4–10 axis

Home, family and the private self sits opposite public standing and direction of work. A planet in one is automatically opposing the other, so an overlay here is always a statement about both — they end up inside the part of your life outsiders do not see, measured against the relationship becomes visible to others and affects how you are read.