Why is Aquarius air signs?

Air signs includes Gemini, Libra and Aquarius. Ancient western philosophers believed that the four elements that constitute natural objects and derive everything are water, fire, earth and wind, and the earth's movement according to the ecliptic is actually the flow and change of the four elements. Therefore, the zodiac 12 can also be divided into water signs, such as cancer, Scorpio and Pisces. Fire signs, such as Aries, Leo and Sagittarius; Earth signs, such as Taurus, Virgo and Capricorn; Air signs, such as Gemini, Libra and Aquarius. Water symbolizes spring and emphasizes emotion; Fire constellation symbolizes summer, emphasizing behavior; The earth sign symbolizes autumn and represents pragmatism and stability; The weather vane symbolizes winter,