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7th house overlay
Their planet in your 7th house: the pairing reads as a formal partnership, which is what tradition considers the point.
What this house covers, and how often it fills
This house pairs with the 1st across the chart — first impressions and self-presentation — 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 Venus, so a partner's venus arriving here doubles the theme rather than adding a new one.
Being angular, it shifts first when the birth time is off. How much →
The 7–1 axis
Partnership as an arrangement sits opposite first impressions and self-presentation. A planet in one is automatically opposing the other, so an overlay here is always a statement about both — the pairing reads as a formal partnership, which is what tradition considers the point, measured against they change how you come across before you decide to change anything.