Your zodiac sign — more precisely your Sun sign — is the constellation the Sun appeared to pass through at the moment you were born. For most people, "what's my sign?" simply means "what's my Sun sign?" It's the sign you read in newspaper horoscopes and the one that defines your core personality in pop astrology.
But the Sun sign is only one layer. A full birth chart contains ten planets, twelve houses, and dozens of aspects. Your Sun sign is the headline; the rest of the chart is the story.
Astrology follows the tropical calendar, which is tied to the seasons, not the visible constellations. Here are the standard date ranges:
| Sign | Symbol | Dates | Element |
|---|---|---|---|
| ♈ Aries | Ram | Mar 21 – Apr 19 | Fire |
| ♉ Taurus | Bull | Apr 20 – May 20 | Earth |
| ♊ Gemini | Twins | May 21 – Jun 20 | Air |
| ♋ Cancer | Crab | Jun 21 – Jul 22 | Water |
| ♌ Leo | Lion | Jul 23 – Aug 22 | Fire |
| ♍ Virgo | Maiden | Aug 23 – Sep 22 | Earth |
| ♎ Libra | Scales | Sep 23 – Oct 22 | Air |
| ♏ Scorpio | Scorpion | Oct 23 – Nov 21 | Water |
| ♐ Sagittarius | Archer | Nov 22 – Dec 21 | Fire |
| ♑ Capricorn | Sea-Goat | Dec 22 – Jan 19 | Earth |
| ♒ Aquarius | Water-Bearer | Jan 20 – Feb 18 | Air |
| ♓ Pisces | Fishes | Feb 19 – Mar 20 | Water |
Boundary dates can shift by a day year to year because of leap years. If you were born on a cusp (the first or last day of a sign), you need your exact birth time to be certain.
Every sign belongs to one of four elements, which describe the core temperament:
Signs of the same element naturally get along; signs of compatible elements (Fire-Earth, Water-Air) balance each other. This is the foundation of compatibility.
A common myth is that cusp babies "are both signs." Astrologically, the Sun is in exactly one sign at any moment. If you were born at 11am and the Sun moved into Taurus at 3pm that day, you are a Taurus — not an Aries-Taurus blend.
The only way to know for sure is a precise birth time. That's exactly what a birth chart calculator needs: date, time, and city.
Your Sun sign is your identity. But two more signs shape you deeply:
Someone with a Leo Sun, Pisces Moon, and Scorpio Rising is a very different person from a Leo Sun with a Capricorn Moon. The free Cosmic Compass birth chart reveals all three in seconds.
Once you know your sign, the fun begins. Cosmic Compass gives you a free daily horoscope generated by AI, plus a complete birth chart, tarot draws, and compatibility checks — no signup required.
The Sun is in only one sign at a time. If you were born on a boundary date, use your exact birth time in a birth chart calculator to determine your true Sun sign with certainty.
No. Your Sun sign is fixed by your birth date and time. The 'changing zodiac' claims you may see online refer to the sidereal (constellation-based) system, which most Western horoscopes do not use.
Your Sun sign is your core identity, your Moon sign is your emotional inner world, and your Rising sign is the face you show others. Together they form the foundation of your birth chart.