Seventh House
The other person — partnership, marriage, and open opposition.
The seventh house begins at the Descendant, directly opposite the Ascendant, and it holds everyone you meet as an equal: spouses, business partners, close collaborators, and declared enemies, which the tradition puts in the same house for good reason.
Read it for what you look for in a counterpart and what you consistently end up across the table from — the two are more closely related than most people would like.
Directly across the wheel is the first house. Opposite houses work as a pair — what is emphasised in one is usually being answered for in the other.
Which planets fall in your own seventh house depends on your birth time to the minute. Cast the chart — free, and it will tell you honestly if the time you have isn't enough to place them.