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Their Sun in your 7th house
You each show up more fully together
In synastry, you place one person's planets into the other person's houses. When someone's Sun, who you are, falls in your 7th house, Bonds, that part of them shows up in the part of your life about relationships, partners, marriage.
What it's like
Across a long dinner you both seem more like yourselves, which is rather the point of a partnership. The wrinkle is who gets to lead, and it's worth saying aloud before it's argued about.
The good
They see you clearly and say so
The tension
Who leads can become a quiet tug of war
The other way round: Your Sun in their 7th house
You light up their one-to-one life
This person tends to take you seriously as a partner, in whatever sense. Your Sun in their 7th makes you a mirror: they see what they want, and what they are missing, in how they relate to you.
About Sun
The Sun is your core self: the thing you're here to become and the energy you run on when you're most yourself. It's the sign you already know, but it's only the headline, not the whole story.
About the 7th house, Bonds
The 7th house is about the people you pair up with: partners, spouses, best friends and business allies, plus the occasional worthy rival. It shows what you look for in another person and what they mirror back.