Pillar article
The Sun in the 7th House
The Sun burns a house it occupies with authority and distance. In the 7th that distance is the marriage, unless the lagna makes the Sun a better lord than the proverb allows.
A hot graha in the spouse's house
The Sun is a natural malefic and a separative planet. In the 7th house it puts authority, pride, and distance into marriage. One partner may dominate, or the bond may feel like a court rather than a companionship. The Sun also aspects the lagna from the 7th, so the self receives that solar glare. This is why the placement is not considered good for marriage as a default.
The default fails for some lagnas. For Leo the Sun is the lagna lord, and a lagna lord in the 7th ties the life to partnership in a solar way that can still function. For Aquarius the Sun rules the 7th, so the Sun in the 7th is the marriage lord in its own house only if the 7th is Leo, which it is: Leo is seventh from Aquarius. That is the 7th lord in the 7th, a strength, wearing a solar style.
Aries is the debilitated case
The Sun is debilitated in Libra. Libra is the 7th from Aries, so an Aries lagna with the Sun in the 7th is the placement in its weakest sign. Venus, who rules Libra and the 7th, must host a fallen Sun in the marriage house. That is the chart the proverb is really describing, and it should not be pasted onto a Leo Sun in the 7th for an Aquarius lagna, where the Sun is in its own sign.
The Sun's mahadasha is only 6 years. For Aries the 7th lord is Venus, whose 20 years live beside that fallen Sun.
Combustion of the other tenants
A Sun in the 7th can combust Venus when Venus is close, muffling the marriage karaka in the marriage house. Venus in another sign is not burned. Jupiter's aspect softens the glare. The Sun's Navamsa shows whether the pride holds. An exalted Sun with Aries on the 7th, which is a Libra lagna, is a strong Sun rather than the Libra fall.
Frequently asked questions
Why is the Sun disliked in the 7th?
It is separative and authoritative in the marriage house, and it aspects the lagna. The Aries-lagna case is worse because the 7th is Libra, the Sun's fall.
When is a 7th-house Sun actually strong?
For Aquarius lagna the 7th is Leo, so the Sun is the 7th lord in its own sign. That is strength with a solar style.
How long is the Sun's own period?
Six years. The 7th lord's dasha, which may be Venus or another planet, times the marriage beyond those six.
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D1, D9, D10, dashas, yogas, and transits, the same calculations referenced in this article.