House 7 begins at the Descendant, opposite the Ascendant. It represents the relationship to others: partnership, associations, contracts, cooperation — and, more broadly, the way one seeks balance with another person.
A planet in House 7 often colors the type of partner or association you seek, or the dynamic at play in your one-to-one relationships.
Angular house (with Houses 1, 4, and 10): like the other three angles of the chart, House 7 is judged in classical doctrine among the strongest — a planet at the Descendant acts with more force and visibility than elsewhere.
Natural sign and ruler: Libra, ruler Venus — consistent with the theme: Libra is itself the sign of relationship and balance between two people. See the Libra entry.
No planet finds its joy in House 7 in the classical doctrine of the seven planetary joys (see House 1) — a second angle outside this scheme, which only covers 7 of the 12 houses.