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The sun sign is the best-known component of an astrological chart: it is the one people cite spontaneously when saying "I am a Cancer" or "I am a Capricorn". It corresponds to the zodiac sign in which the Sun stood at the moment of your birth. Since the Sun stays in each sign about a month, this reference is stable and in principle depends only on the date. Our tool determines your sun sign and offers an encyclopedic reading, faithful to the Western astrological tradition.
The sun sign refers to the segment of the tropical zodiac the Sun occupied on the day of your birth. The twelve signs (Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces) divide the ecliptic into thirty-degree arcs each. This division goes back to Babylonian astronomers of the 1st millennium BCE and was systematized by the Hellenistic Greeks, notably Ptolemy in the Tetrabiblos (around 150 CE). In tradition, the Sun stands for conscious identity, will, vitality, and the sense of personal direction.
For a reliable result, enter your date of birth. For births falling around a sign change (usually the 20th or 21st of the month), the time and place of birth may be needed: the Sun changes sign at a precise instant, and depending on the local time zone, your sign can tip into the next one. Outside these so-called "cusp" days, the date alone is enough. Our tool uses astronomical ephemerides to place the Sun to the degree in the tropical zodiac.
The sun sign describes only part of your personality. For a nuanced portrait, cross it with your ascendant and your moon sign. Also identify the element of your sign (fire, earth, air, water) and its mode (cardinal, fixed, mutable), which reveal structural affinities. Beware of simplified horoscopes that only consider the sun sign: they ignore nine-tenths of the information in a natal chart. Astrology remains a cultural symbolic framework, not a scientifically validated knowledge.
Because the sign-change dates vary slightly from year to year, depending on the Sun's actual position. The Sun enters Aquarius around January 20, but the exact time changes each year. For births around these dates, only a precise calculation with time and place can settle the question.
No. The sun sign is an entry point but represents only one planet out of ten in a complete natal chart. The ascendant, the Moon, the other planets, and the houses provide a far finer reading. That is why two people with the same sun sign can have very different charts.
Astronomy recognizes that today the Sun crosses the constellation of Ophiuchus a few days a year. But Western astrology rests on the tropical zodiac, founded on the seasons rather than on present-day constellations. Within this symbolic framework, the twelve signs have remained the reference since antiquity.
Yes. Tropical astrology, dominant in the West, takes the spring equinox as its origin. Sidereal astrology, used in particular in the Indian (Jyotish) tradition, aligns with the actual constellations. Because of the precession of the equinoxes, the two systems differ today by about twenty-four degrees.