In astrology, the Sun and the Moon are considered planets. The Sun is the most crucial part of the sky. It illuminates the other planets. The Sun in your birth chart is your identity. It also symbolizes your purpose. Your Sun sign isn't everything, but you can tell a great deal about yourself by studying where the Sun was when you were born.
Someone with a Gemini Sun may shine when learning and talking. A Capricorn sparkles it comes to working. What house it's in also matters. A person with a Gemini Sun in the 11th house has a strong need to belong. A person with Capricorn Sun in the 1st house may be courageous and independent.
"A full understanding of the Sun in a birth chart is an important step toward understanding the person". - Robert Hand, astrologer