Sun Sign Calculator

Your sun sign is the zodiac sign the Sun was in when you were born. It is the most-used placement in popular astrology — your "star sign" — and represents your core conscious identity, what you build, and what energizes you.

Enter your birth date into the calculator above. Time and place are not required for sun sign — the Sun is in the same sign for an entire month, so the date alone is enough unless you were born within a day of a sign change ("on the cusp").

Sun sign dates shift slightly year to year. If you were born within a day of a sign change (e.g., Aug 22 or 23), the calculator above gives you the precise sign by computing the Sun's exact position for your specific birth year. There is no "in between" — you are one sign or the other.

"Star sign" is the colloquial term used in newspaper horoscopes; "sun sign" is the astrological term. They mean the same thing — the zodiac sign the Sun was in when you were born.

Sun position follows the project accuracy contract for planetary longitude, so sign placement is reliable for any birth date except rare sign-boundary cases where exact time and timezone matter.