Because it was invented by westerners.
So it is divided according to the solar calendar.
Aries:
From March 265438, 0 to April 65438, 09.
Taurus:
April 20-May 20
Gemini:
May 2 1- June 2 1
Cancer:
22 June-22 July
Leo:
23 July-22 August
Virgo:
23 August-22 September
Libra:
September 23rd-65438+1October 23rd.
Scorpio:
65438+1October 24th-165438+1October 2nd1.
Sagittarius:
165438+1October 22nd-65438+February 2nd1.
Capricorn:
65438+February 22nd -65438+ 10/9
Aquarius:
65438+1October 20th-February 18
Pisces:
February 65438-March 20, 2009