What Zodiac Sign Am I? Enter Your Birthday and Find Out

The western tropical zodiac divides the year into twelve equal slices of thirty degrees each, anchored to the March equinox. Your zodiac sign is the slice the Sun occupied on the day you were born. No birth time needed, no star chart required.

At its core, this is a calendar question with a definite answer.

That answer is a convention, and you should know that up front rather than discover it three pages deep. The tropical zodiac is a symbolic system people have used for self-reflection and storytelling for a very long time. It is not astronomy's map of the constellations; the two parted ways many centuries ago.

Nor is it a science-backed method for predicting your week. I treat it as a mirror you can pick up, look into, and put back down whenever you like.

The calculator above settles the mechanical question in seconds: your birth date points to one of twelve windows, and you get its name. What that window means, where it came from, and how much weight it can carry - those are the interesting questions. For the full anatomy of the system, What Your Sun Sign Actually Means: The Zodiac System in Plain English is the place to start.

The Sun appears to travel a full circle around the sky over the course of a year, moving about one degree per day along the path astronomers call the ecliptic. Tropical astrology cuts that circle into twelve equal windows of roughly thirty days each. Aries opens at the March equinox and the other signs follow in order.

When someone says "I'm a Taurus," they mean the Sun was traveling through the Taurus window when they were born - in most years, roughly April 20 through May 20.

Why "in most years"? The calendar and the sky keep slightly different time. One full cycle of the seasons - the tropical year - runs 365 days, 5 hours, 48 minutes, and 45 seconds, while the calendar insists on tidy 365-day years with a leap day every fourth year.

Each common year lets the seasons drift about 5 hours and 49 minutes earlier against the calendar; leap day then yanks them back by about 18 hours. The see-saw never balances perfectly, so every sign boundary wanders within about a day from one year to the next.

Born on August 3? You are a Leo in every year the tables cover, and the calculator will tell you so instantly. Born near a switch point - a late-April or late-September birthday, say - and the year becomes the deciding fact.

That is why this site's tools ask for your birth year while most date tables you have met do not.

The full reference for all twelve windows, with each sign's typical dates and its exact boundary days listed year by year, lives in the 12 zodiac signs. Why Zodiac Sign Dates Change Every Year (It's Not What You've Heard) walks through the mechanism without the folklore.

Every sign has two boundary days in the calendar, the day it begins and the day it ends. One of those days in any given year is the day the Sun switches signs. If your birthday lands there, a static table has to guess.

Most of them guess quietly and move on. This site does not.

In 2026 the Sun entered Libra on September 22 at 8:06 PM Eastern time. So if you were born on September 22, 2026, you are a Libra - unless you were born before the switch moment, in which case Virgo applies. That is the shape of the answer: the date and year settle which day is in play, and on the switch day itself the birth time closes the file.

Without the time, the verdict stays open, and the calculator says so rather than dressing up a coin flip as certainty.

None of this makes you "two signs," whatever the cusp lore promises. The Sun occupies one sign at any moment; the multi-day "cusp windows" on many sites are a newspaper-era tradition rather than an astronomical fact. That tradition is worth knowing about on its own terms.

It just is not a membership card.

If your birthday falls on any boundary, Born on the Cusp? Your Real Sign Depends on Your Birth Year turns the date-year-time ladder into a five-minute checklist. The whole cusp dates category covers the edge cases.

Your sun sign is one placement among the many astrologers talk about, and it is the only one a birth date alone can support. The moon sign and the rising sign both require your exact birth time, and the rising sign also needs your birth place, because it changes roughly every two hours as the horizon rotates. This site deliberately computes only the sun sign.

A date-only tool that hands you a moon or rising sign is guessing and calling it arithmetic. Sun, Moon, and Rising Signs: Why We Only Calculate Your Sun Sign explains why I would rather point you there than fake the other two.

What the sign itself gives you is a lens, not a forecast.

The tradition attaches symbolism to each window, and that symbolism can be fun to think with: vocabulary for parts of a temperament, a shared language with friends, a gentle prompt toward self-reflection.

What controlled testing has failed to find is predictive power behind the symbolism. When researchers have put astrology's specific claims to the test, the results have not supported them. Pretending otherwise would make this site the kind of mystification it exists to avoid.

Is Astrology Accurate? What the Science Actually Found gives the fair, cited version of that record.

Compatibility follows the same rules. Reading two sun signs through their elements and modalities is an old, coherent game with real value as a conversation starter, and no demonstrated ability to predict whether a relationship works.

That is why our compatibility reader gives you a pattern with shared strengths and typical frictions instead of a percentage: a number would imply a precision nobody has.

Is my star sign the same as my sun sign?
Yes. "Star sign" and "sun sign" are two names for the same thing in western astrology: the sign the Sun occupied at your birth.

Another site gave me a different sign. Now what? Check whether your birthday is a boundary day. If it is, the other site likely used a static table that ignored your birth year, which is where those tables get it wrong. Run the date through the calculator above with the year included.

Can I look up someone else's sign?
Of course. The calculator is a lookup, so it works for a partner's or a friend's birthday just as well as your own.

What about February 29?
The calculator validates leap years, so the date is handled rather than rejected. Should a February 29 birthday ever land on a sign boundary, the year and, if needed, the time decide it like any other.

Do you write horoscopes?
No. There are no horoscopes anywhere on this site; forecast text would rot the day after publishing, and prediction is not what this tradition is for. What you get instead is reference material and tools that stay true. Zodiac Sign Calculator: Find Your Sign by Birth Date (Honest Cusp Verdicts) has the full detail of how verdicts work.