Sun in the 7th house (Yuvati / Kalatra, the house of marriage) brings the significations of Sun, namely soul (atma), father, authority & government, into the area of marriage, the spouse, partnerships and one-to-one relationships. The 7th house governs marriage & spouse, partnerships, business dealings, passion & desire.
Results of Sun in the 7th House
Sun is a malefic planet, so here it tends to bring low confidence, ego conflicts, trouble with father or bosses, and weak vitality focused on marriage, the spouse, partnerships and one-to-one relationships. As an angular (kendra) house, this placement strongly shapes the overall life direction.The exact result depends on which sign Sun occupies here and the aspects it receives.
When It Activates
These results typically surface during the Vimshottari mahadasha or antardasha of Sun, and when transiting planets trigger the 7th house. A well-placed Sun here supports a fulfilling marriage, strong partnerships and good business alliances; when afflicted it can indicate marital discord, broken partnerships and difficulty with the spouse.