What astrological sign starts on January 21st?

The astrological sign that starts on January 21st is Aquarius.

In the standard Western zodiac, Aquarius follows Capricorn and generally covers January 20 or 21 through February 18 or 19. Its symbol is the Water-Bearer, but Aquarius is an air sign rather than a water sign—a frequent point of confusion. The “water” represents ideas or knowledge being poured out to humanity.

Aquarius is traditionally ruled by Saturn and, in modern astrology, is also associated with Uranus. It is classified as a fixed sign, alongside Taurus, Leo and Scorpio. People born near January 20–21 may encounter slightly different boundary dates because astrological calendars can vary by year, time zone and the convention used.

Aquarius should also be distinguished from the astronomical constellation Aquarius. The constellation occupies a region of the sky, while the astrological sign is a symbolic 30-degree division of the zodiac. In Western astrology, the sign’s name comes from the Latin word for “water-carrier.”