Zodiac Sign Calculator - Find Your Western Astrology Sign

The 12 Zodiac Signs

Western astrology divides the year into twelve signs based on the position of the Sun relative to constellations at the time of birth. Each sign spans approximately 30 days.

Elements

Each sign belongs to one of four elements: Fire (Aries, Leo, Sagittarius), Earth (Taurus, Virgo, Capricorn), Air (Gemini, Libra, Aquarius), or Water (Cancer, Scorpio, Pisces). The element shapes the sign's core energy.

Modalities

Signs are also classified by modality: Cardinal (initiators: Aries, Cancer, Libra, Capricorn), Fixed (stabilizers: Taurus, Leo, Scorpio, Aquarius), or Mutable (adapters: Gemini, Virgo, Sagittarius, Pisces).

Cusp dates

People born within a few days of a sign boundary (the "cusp") are sometimes said to share traits of both adjacent signs. The exact cutover date can vary slightly by year because the Sun does not enter each sign on the exact same date every year. This tool uses the standard tropical zodiac boundary dates.

Frequently asked questions

What is the difference between Western and Vedic astrology signs?

Western astrology uses the tropical zodiac, fixed to the seasons (vernal equinox = 0° Aries). Vedic (Jyotish) astrology uses the sidereal zodiac, aligned with actual constellations. Because of Earth's axial precession, the two systems are currently about 23° apart, meaning your Vedic sign may differ by one sign from your Western sign.

What is the rarest zodiac sign?

Ophiuchus is sometimes called the "13th sign" but is not part of the traditional Western zodiac. Among the 12 standard signs, Capricorn, Aquarius, and Aries are statistically the least common birth signs in the Northern Hemisphere because they fall during months with fewer births.

Sidereal vs. tropical zodiac

The two main astrological traditions use fundamentally different reference points for the zodiac:

• Tropical zodiac (Western astrology): anchored to the seasons. 0° Aries always begins at the March vernal equinox, regardless of where the actual constellation Aries appears in the sky. The signs are fixed to Earth's orbit around the Sun.
• Sidereal zodiac (Vedic / Jyotish astrology): anchored to the actual positions of the constellations in the sky. Uses the ayanamsa - a correction offset that currently runs approximately 23–24°.

The difference arises from the precession of the equinoxes: Earth's rotational axis wobbles slowly over a 26,000-year cycle, causing the vernal equinox point to drift westward against the background stars at roughly 50 arc-seconds per year. Over 2,000 years since classical astrology was codified, this has accumulated into a roughly one-full-sign offset. A person who is Pisces in the Western tropical system is typically Aquarius in the Vedic sidereal system.

Ophiuchus

The Sun passes through 13 constellations during the year, including Ophiuchus (the serpent-bearer) between approximately November 29 and December 17 in the sidereal sky. Western tropical astrology deliberately uses 12 equal 30° divisions - not the actual constellation boundaries - so Ophiuchus is not, and has never been, a sign in the Western system.

The story that NASA or astronomers "added a 13th sign" is a recurring misconception. Astronomy and astrology are separate disciplines. Astronomers mapped the ecliptic constellations (13 of them) as a factual observation; astrologers chose 12 equal divisions for the tropical zodiac as a symbolic framework. Neither change is pending.

Birth chart context

Your sun sign - determined by the position of the Sun on your birthday - is the most widely known astrological indicator, but it is only one element of a full natal chart (birth chart). A complete chart maps the position of all planets, the Moon, and the Ascendant at the exact time and place of birth:

• Moon sign: the sign the Moon occupied at birth. Often considered to reflect emotional patterns and inner life.
• Rising sign (Ascendant): the zodiac sign rising on the eastern horizon at the moment of birth. Changes approximately every two hours, so birth time matters for this calculation. Considered in many traditions to represent outward personality and appearance.
• Planetary positions: Mercury, Venus, Mars, Jupiter, Saturn, and outer planets each occupy a sign and a house, adding further nuance to the chart.

The common oversimplification "I'm a Scorpio" refers only to the sun sign. In natal astrology, a person is the entire chart - not a single sign.