Find zodiac sign

Match a Gregorian birthday to the conventional twelve Western tropical sign ranges and their classical element and ruler.

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ToolZodiac Sign Finder
Input
Output
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How it works

The month and day are compared with twelve fixed intervals, with Capricorn handled as the range crossing 31 December. The validated year does not affect the lookup, and the stored classical rulership keeps Saturn for Aquarius, Jupiter for Pisces, and Mars for Scorpio.

  • These are newspaper-style tropical dates rather than a calculation of the Sun’s astronomical constellation.
  • Because the boundaries are fixed, a cusp birthday is not resolved from birth time, year, and location.

Worked example

15 June
Input
											1990-06-15
Output
												Sign: Gemini
Dates: 21 May to 20 June
Element: Air
Ruling planet: Mercury

When to use this

Western horoscope columns group entries by sun sign, astrology-themed profiles attach one of four elements, and history classes compare tropical signs with sidereal systems and IAU constellations.

Edge cases

  • A date exactly on a listed cusp follows the fixed table even though the actual solar transition can shift with year and time.
  • The returned tropical label can differ from the IAU constellation occupied by the Sun because the two divide the ecliptic differently.
  • 2000-02-30 is rejected as an impossible Gregorian date instead of being normalized into March.