Sun in the seventh house brings authority and individual purpose into marriage, committed partnership and public dealings. A strong seventh lord can help the native and partner negotiate clear roles. When the Sun is afflicted and the seventh lord lacks support, the need to lead can become conflict over whose priorities prevail.
Partnership needs room for both roles
The seventh’s spouse and union meanings appear in Brihat Parashara Hora Shastra. A supported Sun can make a partner or collaboration prominent in the native’s life. A difficult Sun can make recognition and control recurring points of disagreement, especially when Venus and the seventh lord repeat the strain. Venus in the seventh emphasizes cooperation; Mercury in the seventh emphasizes negotiation.
In a whole-sign Aquarius-rising chart, the Sun in Leo occupies and rules the seventh. Its own-sign strength is a different condition from a Sun dependent on a weakened dispositor. That strength must still be read alongside the other influences on the house and relevant D9 support.
The Sun’s seventh aspect reaches Lagna. Partnership can strongly shape the native’s public identity and decisions. A sound Lagna lord helps preserve personal direction while making room for the other person’s contribution. Compare Jupiter in the seventh.
For possible separation, require corroborating affliction to the seventh lord, relationship karakas, Navamsa and activating periods. The occupied Sun may describe the source of conflict; the rest of that mechanism distinguishes a workable disagreement from a more serious break. Dignity and rulership must be assessed separately.