Sun in the Signs and Houses
The short answer
Pick the sign Sun was in when you were born for every date it was there from 2000 to 2035, or the house it falls in for your rising sign.
Sun has twelve sign pages and twelve house pages. The centre of the chart: the sign it was in on the day you were born is your zodiac sign, and its house shows where you are most yourself.
Sun in each sign
Every date Sun was in the sign from 2000 to 2035, read from the ephemeris, so you can check a birth date against it.
Sun in each house
Which sign puts Sun in that house for your rising sign, with whole-sign houses.
Every planet · Cast your free birth chart to see where Sun sits in yours.