Here are the twelve date ranges. Then the part most articles skip: the sign the calendar gives you is roughly 24 degrees away from the constellation the Sun is actually in. That is not a mistake. It is a deliberate choice made about two thousand years ago, and knowing why makes the whole system easier to understand.
The twelve date ranges
Boundaries shift by a day either way depending on the year and your time zone, because the Sun does not care about our calendar.
- Aries — March 21 to April 19
- Taurus — April 20 to May 20
- Gemini — May 21 to June 20
- Cancer — June 21 to July 22
- Leo — July 23 to August 22
- Virgo — August 23 to September 22
- Libra — September 23 to October 22
- Scorpio — October 23 to November 21
- Sagittarius — November 22 to December 21
- Capricorn — December 22 to January 19
- Aquarius — January 20 to February 18
- Pisces — February 19 to March 20
Why your sign is not where its constellation is
Earth's axis wobbles. Not quickly — one full circle takes about 25,800 years — but steadily. This is called the precession of the equinoxes, and Hipparchus noticed it in the second century BC.
Western astrology uses the tropical zodiac, which is anchored to the seasons rather than the stars. Zero degrees Aries is defined as the March equinox — the moment the Sun crosses the celestial equator going north. That point is fixed to Earth's orbit, not to any constellation.
When that system was formalised, the equinox happened to fall near the constellation Aries. Since then precession has moved the equinox roughly 24 degrees — nearly a full sign. So if you were born on April 1, the calendar calls you Aries, while the Sun was physically in front of Pisces.
Both statements are correct. They are answering different questions: where is the Sun relative to the seasons, versus which stars are behind it.
What about Ophiuchus?
The Sun does pass in front of Ophiuchus for about eighteen days each year. This gets rediscovered by headline writers every few years as though astrology has been caught out.
It has not. The zodiac was never a list of every constellation on the Sun's path — it was a division of the year into twelve equal 30-degree segments. Constellations are irregular; some are large, some tiny. Twelve equal segments was a calendar decision, not an astronomical claim. Sidereal astrology, used in the Vedic tradition, does track the constellations, and its dates differ accordingly.
The four elements
Each sign belongs to an element, which is often more useful than the sign itself when you are trying to understand compatibility.
- Fire — Aries, Leo, Sagittarius: initiating, expressive
- Earth — Taurus, Virgo, Capricorn: practical, sustaining
- Air — Gemini, Libra, Aquarius: connecting, conceptual
- Water — Cancer, Scorpio, Pisces: feeling, absorbing
FAQ
Did the zodiac dates change?
No. The tropical dates used in Western astrology have not moved, because they are tied to the equinox. What changed — slowly, over millennia — is which stars sit behind the Sun on those dates.
What if I was born on a cusp?
There is no cusp in the technical sense; the Sun is in one sign or the other at any instant. If you were born within a day of a boundary, calculate the exact position — our free birth chart does it for your birth time and place.
Is Ophiuchus a 13th sign?
It is a constellation the Sun passes through, not a sign in the tropical system. Twelve equal segments was always a calendar convention.
Which is correct, tropical or sidereal?
They measure different things. Tropical tracks the seasons, sidereal tracks the stars. Neither is an error; they answer different questions.
For reflection, not fate. The astronomy above is measurable; what you make of the symbolism is yours.