Sun in the 1st House: Meaning and Tendencies
What Sun signifies
Sun is the kāraka of ātma (the soul), vitality, authority, the father, and one's sense of dignity and purpose (BPHS Ch. 3 (Graha significations); Phaladīpika Ch. 2). Sun's signification travels wherever Sun sits. In the 1st house, Sun meets self specifically — the pairing this page is about, house by house across every one of Sun's twelve placements. One more constant travels with Sun into every house: classically Sun is a natural malefic (pāpagraha), so a Sun placement is read for the strength and heat it brings, not automatic ease.
What the 1st house governs
The 1st bhāva is classically read as the house of self, body, vitality, identity, and life direction. By quadrant, the 1st house is a kendra (angular) house: BPHS's shadbala gives kendra houses the most of the three classes' positional strength (sthāna bala). That quadrant strength is the 1st house's starting baseline. Its own sign and its lord shape self first; anything aspecting the 1st house adds more on top. Sun enters this picture only after that baseline is already set.
Sun in the 1st house
When Sun occupies the 1st house, Sun's significations — ātma (the soul), vitality, authority, the father, and one's sense of dignity and purpose — express through self, body, vitality, identity, and life direction. Because the 1st house is kendra, results here tend to read as outward and prominent — the way kendra results classically show. Sun does not override the 1st house's own quadrant nature; it colours it. The sign the 1st house falls in for you, Sun's own dignity there, and what aspects the 1st house all decide how this actually plays out.
This house's own significator
The 1st house's own naisargika kāraka (BPHS 32.34) is Sun — the very graha placed here for this reading. Sun both occupies the 1st house and rules it by nature: a doubly-emphasized placement. Because of that overlap, self tends to be an especially direct theme in the 1st house once Sun's own sign and dignity are read.
How to read this
Sun in the 1st house is a classical tendency, not a verdict — read it that way. What actually decides how self plays out: the sign the 1st house falls in for you. Also decisive: what aspects the 1st house, and whether a Sun daśā or antardaśā is running for you right now. A page about the 1st house in general cannot see either of those two things — your own chart, with your real 1st house, can.