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Zodiac Sign Calculator

Enter a birth date to find the corresponding zodiac sign.

Zodiac sign

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What this calculator does

This tool looks up the Western tropical zodiac sign associated with any birth date, using the standard 12-sign date ranges recognized across most Western media and publications. For the 12-year cycle used in East Asian astrology instead, see the Chinese zodiac calculator.

Worked example

A birth date of September 2 falls under Virgo, which spans August 23 to September 22.

Common mistakes

  • Assuming boundary dates are identical everywhere. Different sources list slightly different cutoff days for sign transitions — this tool uses the most widely cited ranges.
  • Confusing tropical and sidereal zodiacs. Western horoscopes use the tropical system; Vedic astrology uses sidereal, which can place the same birth date under a different sign entirely.
  • Treating this as an astronomical calculation. This is a conventional calendar-based lookup, not a measurement of actual star or constellation positions on your birth date.

Frequently asked questions

What zodiac system does this use?+

The Western tropical zodiac, the 12-sign system most commonly referenced in Western media, based on fixed date ranges tied to the calendar year.

Why do zodiac date ranges sometimes vary slightly between sources?+

The exact boundary dates can shift by a day depending on the year and source, since sign transitions are based on the sun's position and don't always land on the exact same calendar date every year. This calculator uses the most commonly cited date ranges.

What's the difference between tropical and sidereal zodiac systems?+

The tropical zodiac (used here and in most Western astrology) is based on the seasons and the calendar. The sidereal zodiac (used in Vedic astrology) is based on the actual current positions of constellations, which have shifted over centuries — the two systems can assign different signs to the same birth date.

Is this calculator based on astronomy or astrology?+

It's a straightforward date-range lookup matching the conventional astrological zodiac calendar, not an astronomical measurement of star positions.

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