The 7th house is anchored by the Descendant and describes committed partnership: marriage, close collaboration, and the specific people who end up mirroring back exactly what you haven't fully faced in yourself.
It's an angular house, opposite the 1st, and the contrast between the two is one of the chart's most reliable stories: the instinctive self you lead with alone versus who you become once someone else is genuinely in the picture.
Traditionally this is the house of marriage and the spouse, but its real domain is broader than the wedding itself: business partners, collaborators bound by formal agreement, contracts, and negotiations entered in good faith. Older texts also give the 7th house rulership over open conflict, lawsuits, and declared rivals, the counterpart on the other side of a negotiating table as much as the one standing across from you at the altar. What ties all of this together is structure: the 7th house describes any bond formal enough that both sides are genuinely accountable to each other, whether that accountability was sealed with vows, a signature, or simply an agreement both people intend to honor.
The Descendant sits directly opposite the Ascendant, and that single fact explains most of what this house is doing in a chart: it's the point where somebody else's will, needs, and perspective become as real and unavoidable as your own. The people found here often carry unusual weight, sometimes recognized almost immediately, because a bond serious enough to qualify for this house tends to surface exactly what a person hasn't yet faced alone, a strength admired before it's claimed, a flaw resisted until someone standing directly across from you names it. That's the seed of what's sometimes called projection, though the 7th house isn't only about what gets projected. It's about the whole experience of encountering another autonomous person closely enough that they can agree with you, negotiate with you, or oppose you outright. Read plainly, the 7th house describes the significant other in a life, the partners, spouses, collaborators, and counterparts met as equals, and what a person learns about themselves only once someone else's perspective has to be genuinely accounted for.