Sun Sign Calculator
Your Sun sign is the heart of your chart, the steady core of identity, will, and the self you grow into over a lifetime.
In astrology, the Sun describes your essential nature: your sense of purpose, your vitality, and the qualities you express most fully when you are being yourself. It is the one placement nearly everyone already knows, because it depends only on the date of birth. The Sun moves through one zodiac sign each month, so the day you were born is enough to determine it, with no birth time or place required.
This calculator finds your Sun sign from the tropical zodiac, the seasonal framework that anchors 0 degrees Aries to the spring equinox, using the same Swiss Ephemeris engine that powers professional astrology software. Because the Sun crosses from one sign into the next on slightly different dates from year to year, a birthday that falls right on a boundary can belong to either sign. If yours is near a cusp, the only way to be certain is to calculate your full birth chart, where the exact moment settles it.
Frequently Asked Questions
Is the Sun sign calculator free?
Yes, completely. You can find your Sun sign here without signing up and without any payment, and from there you can calculate your full free birth chart in the same way.
Do I need my birth time to find my Sun sign?
No. The Sun sign depends only on your date of birth, so the date alone is enough. Birth time and place matter for the rising sign, the houses, and the Moon, which you can see in the full birth chart.
What does the Sun sign actually mean?
It represents the core of your identity: your sense of self, your will, your vitality, and the direction you grow toward. It is one of the three pillars of a chart, alongside the Moon and the rising sign, and it is the most visible part of who you are.
How accurate is it, and what if I was born on the cusp?
The sign is computed with the Swiss Ephemeris, so it is precise for any date. The dates the Sun changes sign shift by about a day from year to year, so if you were born right on a boundary, calculate your full birth chart to confirm it from your exact birth moment.