The free-spirited Aquarius is a water sign born between January 21 and February 18. Charming and with a desire to make the world a better place, an Aquarius tends to make friends easily and have big ideas. But being ruled by Uranus they can be sometimes quite abrupt and cold. The Aquarius symbol is two zig-zag lines parallel to each other, and the star sign is most compatible with Aries, Gemini, Libra and Sagittarius.