Sun is a planet of a sattvic nature. But it is also considered a fierce, cruel and separatist planet. The position of Sun in the seventh house is not considered good for marital relations. From the seventh house of the horoscope, life partner, marriage, business, partnership, life partner's complexion, qualities, nature, personality, character etc. are considered. Due to Sun being in the seventh house, your life partner can be stubborn, grumpy, obstinate but of virtuous nature. There can be leadership quality in him. He can be big thinking and generous hearted. You may have separation from your spouse. There may be a decrease in your marital happiness.
https://www.vinaybajrangi.com/planets/sun/sun-in-seventh-house.php
