Last updated: March 2026
What is a Zodiac Sign?
A zodiac sign is one of 12 astrological divisions of the sky, each associated with a constellation that the Sun passes through during the year. Your zodiac sign (also called your Sun sign or star sign) is determined by the position of the Sun on your date of birth and is believed in astrology to influence your personality, behavior, and life path.
The Western zodiac system has been used for over 2,000 years, originating in Babylonian astronomy around 500 BCE. Today, astrology content receives over 100 million monthly searches globally, and 29% of Americans say they believe in astrology according to Pew Research 2024.
How to Use the Zodiac Sign Finder
Step 1: Select “Find by Birthday” and choose your birth month and day from the dropdowns. Or select “Select Your Sign” if you already know your zodiac sign.
Step 2: View your complete zodiac profile including your element, ruling planet, quality, and symbol.
Step 3: Read your personality overview, strengths, weaknesses, and insights about love, relationships, and career.
Step 4: Check your compatibility quick view to see which signs are your best and worst matches. Click through for a detailed compatibility analysis.
Elements and Modalities Explained
Each zodiac sign belongs to one of four elements and one of three modalities (also called qualities). These classifications add depth to understanding each sign’s character. Fire signs (Aries, Leo, Sagittarius) are passionate, energetic, and action-oriented. Earth signs (Taurus, Virgo, Capricorn) are practical, grounded, and focused on material reality.
Air signs (Gemini, Libra, Aquarius) are intellectual, communicative, and socially oriented. Water signs (Cancer, Scorpio, Pisces) are emotional, intuitive, and deeply connected to feelings.
The three modalities describe how each sign interacts with the world. Cardinal signs (Aries, Cancer, Libra, Capricorn) are initiators and leaders. Fixed signs (Taurus, Leo, Scorpio, Aquarius) are stabilizers who see things through. Mutable signs (Gemini, Virgo, Sagittarius, Pisces) are adaptable and flexible.
How Zodiac Signs Are Determined
The Western zodiac is based on the tropical system, which divides the ecliptic (the Sun’s apparent path across the sky) into 12 equal 30-degree segments. Each segment is named after the constellation that was in that position roughly 2,000 years ago when the system was formalized.
Your Sun sign is the segment the Sun occupied on your birthday. Because the Sun enters each sign at slightly different times each year, people born on the first or last day of a sign period may fall under either sign depending on the year. These boundary dates are called “cusps.” Our tool detects when your birthday falls within two days of a cusp transition and alerts you to the possibility of dual influence.
Frequently Asked Questions
What determines your zodiac sign?
Your zodiac sign is determined by the position of the Sun on your date of birth. The Sun travels through each of the 12 zodiac constellations over the course of a year, spending roughly 30 days in each sign. The dates for each sign are consistent year to year with only minor variations of a day or two.
What are cusp signs?
A cusp sign refers to being born within two days of the transition between two zodiac signs. For example, if you were born on April 19, you're on the Aries-Taurus cusp. People born on cusps may exhibit personality traits of both signs. However, technically you still have one Sun sign — cusps are more of a popular astrology concept than a strict astronomical distinction.
What is the difference between zodiac signs and astronomy?
Zodiac signs are part of astrology, a belief system that interprets celestial positions as influencing human behavior. Astronomy is the scientific study of celestial objects. Due to the precession of Earth's axis, the astronomical constellations no longer align exactly with astrological sign dates, which remain fixed to the tropical zodiac established over 2,000 years ago.
Do zodiac signs ever change?
The tropical zodiac dates used in Western astrology are fixed and do not change with the shifting constellations. The astronomical positions of constellations have shifted due to precession, but astrological sign dates remain based on the seasons — Aries always begins at the spring equinox.
What is the most common zodiac sign?
Studies of US birth data show that Virgo and Libra (August-October birthdays) tend to be the most common zodiac signs, as September is consistently the most popular birth month. Late September in particular sees the highest birth rates.
What is the rarest zodiac sign?
Aquarius (January 20 - February 18) is often cited as the rarest zodiac sign because January and February have the fewest births in many countries. Capricorn is a close second. However, the differences between signs are small — roughly 8-9% of the population falls under each sign.