Horoscope Calculator – What Is My Zodiac Sign?

The wheel of the year

One full turn of the calendar, twelve signs. The wheel starts with Aries at the top and runs clockwise through the year; your sign is picked out in gold, and the ring colours are the four elements — orange for Fire, green for Earth, gold-yellow for Air, blue for Water.

All twelve signs at a glance

The complete table the calculator works from — every sign with its dates, element, modality and traditional ruling planet.

The twelve signs, defined

Definitions only, in the form astrology itself hands them down. Each sign is represented by a traditional figure, belongs to one element and one modality, and is described in the tradition by the short character sketch in the last column — in astrology, these sketches are descriptions of the sign, not findings about any person born under it.

Read the table as a dictionary, not a verdict: in astrology, a description belongs to the sign. Two people who share a sign are not claimed to share a character — the tradition itself separates the sun sign from the moon and rising signs, which is why the fuller calculators linked below exist.

Sign-change (cusp) dates at a glance

The twelve boundaries of the year, from the same classic tropical ranges the calculator uses. The first day in the third column is the standard, most-published date — and it is a rounding. The sun actually enters each sign at one exact astronomical moment (its ingress), and that moment does not land at the same clock time, or even on the same calendar date, every year.

Why the moment moves: a full orbit takes about 365 days and six hours, not the calendar’s flat 365, so each year’s ingress lands roughly six hours later than the year before — until a leap year inserts February 29 and pulls the whole sequence back by a day. Over a four-year cycle a given boundary can therefore sit on either of two neighbouring dates. Time zones move it again in a second way: the ingress is one instant worldwide, but an instant that is late evening on March 20 in one country is already March 21 in another, so two birth certificates for the same moment can honestly show different dates. This page deliberately does not print per-year ingress times: those come from an ephemeris (a published table of the sun’s exact positions, such as the ones astrologers use to cast charts), they differ by year and by place, and a fixed table claiming them for every year would be inventing precision it does not have. The classic first days above are the standard ranges; the cusp flag marks exactly the birthdays where an ephemeris check is worthwhile.

Goes deeper with this one

Your sun sign is the headline. These are the rest of the story tradition tells about a birthday.

February 29 and cusp days, handled explicitly

Two kinds of birthday make readers nervous — the one that only exists every four years, and the ones that sit exactly on a sign boundary. Here is precisely how the calculator treats each, and why.

February 29: the leap-day birthday

The form accepts February 29 in any year you type it. That is deliberate: the month-length table behind the calculator gives February 29 days, because a sun-sign lookup works on month and day, and February 29 falls squarely inside Pisces (February 19 to March 20) whenever it occurs. Add a birth year and one extra check appears — if the year you entered was not a leap year, a note says so, because February 29 did not occur in that year; the sign is still read from the month and day, which is how leap-day birthdays are conventionally handled. In ordinary years most leap-day babies celebrate on February 28 or March 1. Both dates are Pisces dates too, so the celebration day never changes the answer. February 30 and 31, by contrast, are rejected with an error, as is any day past the end of its month — April 31 gets the message “April has only 30 days”, not a sign.

Cusp days: the first and last day of a sign

A cusp-day birthday is any birthday on the first or last day of a sign’s classic range — March 21 or April 19 for Aries, December 22 or January 19 for Capricorn, and so on for all twenty-four edges. Enter one and the calculator still gives the classic table’s answer, but it raises the cusp flag: a note naming the neighbouring sign and explaining that in some years the sun’s actual crossing lands on the neighbouring date. That is the whole of the “cusp” question, stated plainly. In astrology the sun is always in exactly one sign at any moment; nobody is a blend of two sun signs. The uncertainty is purely calendrical — a fixed printed range has rounded a moving astronomical moment into a date, and your year may have rounded the other way. Three facts settle a cusp birthday: the birth date, the birth time, and the birth place, checked against an ephemeris for that year. Without the time, no calculator — this one included — can honestly do better than the flag.

Two worked edges show the pattern. December 21 is the last day of Sagittarius and December 22 the first of Capricorn: enter either and the flag appears, because in some years the sun’s entry into Capricorn falls late enough on the 21st, or early enough on the 22nd, to tip a birth near midnight across the line — and the time zone of the birth place decides which calendar date that moment carried there. March 20 and 21 behave the same way around Pisces and Aries. Birthdays one day further inside a range, and every birthday in the middle of a range, are not flagged: for those dates every year and every published table agree.

Elements and modalities, defined

Every sign carries exactly two group labels — one element and one modality — and in astrology those two labels are a large part of what a sign’s definition is. Both systems are traditional classifications, presented here as the tradition defines them.

The four elements. In astrology, the Fire signs (Aries, Leo, Sagittarius) are described as the energy of the zodiac — enthusiasm, initiative and warmth of temperament. The Earth signs (Taurus, Virgo, Capricorn) are described as the practical register — patience, craft and attention to what is tangible. The Air signs (Gemini, Libra, Aquarius) are described as the realm of ideas — language, exchange and abstraction. The Water signs (Cancer, Scorpio, Pisces) are described as the feeling register — intuition, memory and emotional depth. Those are the traditional glosses; each of the three signs in an element is then distinguished by its modality and its ruling planet, which is why the tradition does not treat the three Fire signs as interchangeable.

The three modalities. In astrology, cardinal signs are described as initiators: each one opens a season — Aries at the March equinox, Cancer at the June solstice, Libra at the September equinox, Capricorn at the December solstice. Fixed signs are described as sustainers, sitting at each season’s height. Mutable signs are described as adapters, closing each season out and handing over to the next. Because the two systems cross, the twelve signs form a complete four-by-three grid — every element contains exactly one cardinal, one fixed and one mutable sign:

So a full traditional definition reads like a coordinate: in astrology, Gemini is defined as the mutable Air sign, Virgo as the mutable Earth sign, and Capricorn as the cardinal Earth sign. Your result reports both coordinates for your sign, alongside its traditional ruling planet — the third label in the classic scheme.

The tropical zodiac and the seasons

The date ranges on this page belong to the tropical zodiac — the system behind almost all Western newspaper and magazine horoscope columns. “Tropical” describes how the system is anchored, and the anchor is the seasons, not the stars.

In the tropical system, the zodiac is the sun’s apparent yearly path (the ecliptic) divided into twelve equal segments of thirty degrees each. The first segment, Aries, begins at the exact point the sun crosses the equator heading north — the March equinox, the start of spring in the northern hemisphere. That single anchor fixes the rest: Cancer begins at the June solstice, Libra at the September equinox, and Capricorn at the December solstice, and the remaining signs fill the thirty-degree steps between those four turning points. This is why tropical sign dates track the calendar of the seasons so closely, and why a sign’s “season” — shown with your result — is a real span of the year rather than a metaphor.

The sidereal zodiac, used in Vedic astrology, anchors the same twelve segments to the constellations instead. The two anchors do not stay aligned: Earth’s axis wobbles slowly (precession, a cycle of roughly 26,000 years), so the equinox point drifts against the stars by a small amount each year, and after two thousand years the drift adds up to roughly three weeks of calendar dates. That is the entire reason the same birthday can be given one sign by a Western table and the previous sign by a Vedic table — two systems, two anchors, both internally consistent. Astronomers would add that, against the actual constellations, the sun’s dates have drifted further still. This calculator is a tropical calculator: it reports the classic Western ranges, flags the birthdays where even those ranges are approximations, and leaves the sidereal answer to a sidereal tool.

Your sign in three steps

How the horoscope calculator works

Going deeper

Sun, Moon and Rising: what this calculator does, and what it does not

Most searches for this page are really asking about three different things. In tradition, the sun sign is where the sun sat on your birthday, the moon sign is where the moon sat, and the rising sign is the sign that was coming over the eastern horizon at the exact moment of birth. They are three different clocks, and they need three different amounts of information.

The moon moves fast — roughly a whole sign every two and a half days — so the date alone is usually not enough to pin it down, and the rising sign changes roughly every two hours, which is why it needs an exact time and a place. That is also why this calculator deliberately asks for so little: a sun sign genuinely needs only the month and the day, except on a boundary day, where the honest answer is that the exact moment matters. Anything that claims your moon or rising sign from a birthday alone is guessing.

One more honest boundary, in the same spirit: this page gives you a sign and the tradition’s description of it, for fun. It does not write a daily horoscope, predict events, or judge compatibility, and no sign description here is a finding about any real person. The sign sketches are what tradition hands down, presented as tradition, not as fact about you.

Frequently asked questions

Related guides

The three signs, explained for fun.

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Birthdays, charts and the slow clocks of the sky.