These are the date ranges for the twelve zodiac signs in Western (tropical) astrology — the dates a horoscope column uses. One thing to know up front: the exact start and end dates can shift by a day from year to year, so if your birthday lands right on a boundary, the year you were born decides your sign.
The twelve sign date ranges
| Sign | Dates | Element |
|---|---|---|
| Aries | Mar 21 – Apr 19 | Fire |
| Taurus | Apr 20 – May 20 | Earth |
| Gemini | May 21 – Jun 20 | Air |
| Cancer | Jun 21 – Jul 22 | Water |
| Leo | Jul 23 – Aug 22 | Fire |
| Virgo | Aug 23 – Sep 22 | Earth |
| Libra | Sep 23 – Oct 22 | Air |
| Scorpio | Oct 23 – Nov 21 | Water |
| Sagittarius | Nov 22 – Dec 21 | Fire |
| Capricorn | Dec 22 – Jan 19 | Earth |
| Aquarius | Jan 20 – Feb 18 | Air |
| Pisces | Feb 19 – Mar 20 | Water |
Why the dates shift by a day
The dates aren't fixed to the calendar the way holidays are; they're fixed to the Sun's actual position. A sign begins the moment the Sun crosses into it, and because the year isn't a whole number of days (which is why we have leap years), that crossing drifts by up to about a day from one year to the next. That's why you'll see Aries listed as starting March 20 in one source and March 21 in another — both are right, for different years. The signs are anchored to the seasons: 0° Aries is the March equinox, so the dates stay put across centuries even as the background constellations drift (the reason the "your sign changed" headlines are misleading).
Where the dates came from
The boundaries aren't arbitrary. The zodiac divides the ecliptic — the Sun's yearly path — into twelve equal 30° segments, and the whole scheme is pinned to the equinoxes and solstices. 0° Aries is fixed to the March equinox, 0° Cancer to the June solstice, 0° Libra to the September equinox, and 0° Capricorn to the December solstice. The other eight signs fall evenly in between. That's why the dates cluster around the 20th–23rd of each month: those are the points where the Sun crosses from one 30° segment into the next. The Babylonians laid down the twelve-part scheme, and Hellenistic astronomers anchored it to the seasons — a choice that's the reason the dates have stayed stable for two thousand years even as the background constellations drifted out of step (the source of the recurring "your sign changed" confusion).
Born on the cusp?
If your birthday falls on the edge between two signs, you were born on the cusp — and only your exact birth year (and ideally a birth chart) can settle which sign the Sun was actually in that day. Popular astrology treats cusp births as blending the two neighboring signs; technically your Sun is in one sign or the other on any given date. If you're a boundary baby, look up your specific year rather than trusting a generic chart.
FAQs
What are the zodiac sign dates? See the table above — they run from Aries (Mar 21 – Apr 19) through Pisces (Feb 19 – Mar 20), about a month each.
Why do zodiac dates vary by a day between sources? Because the signs are tied to the Sun's position, not the calendar, and the Sun's crossing drifts by up to a day each year (the same reason we need leap years). Different sources list different boundary days for different years.
What does it mean to be born on the cusp? Your birthday falls on the boundary between two signs. Popular astrology reads it as a blend; to know your true Sun sign, check your birth year or a full chart.
Do the dates ever actually change? The tropical dates don't — they're anchored to the seasons (0° Aries = the spring equinox). The constellations behind them drift over centuries, but the sign dates astrology uses stay put.
Are the zodiac dates the same every year? Almost. The start and end of each sign can move by about a day depending on the year, because the Sun's crossing isn't perfectly synced to the calendar. If your birthday lands on a boundary, check your specific birth year.
Is the zodiac the same as the constellations? No. The zodiac signs are twelve equal 30° segments tied to the seasons; the constellations behind them are uneven in size and have drifted over millennia. The signs are a coordinate system, not a star map.
Related articles
- Did your zodiac sign change? — why the dates stay fixed.
- Sun sign vs. moon sign
- Zodiac signs and their symbols
About this article
Written by the AstrologyBay Editorial Team. The date mechanics here are factual; the signs themselves are part of the astrological tradition, presented as an interest-and-belief framework.
Sources
(Factual — cite. Verify/insert at review.)
- An astronomy/astrology reference for the tropical sign boundaries and the Sun's seasonal crossings.