How to calculate the constellation?

12 constellation date of birth: 1, Aries: March 2 1 to April 19 2, Taurus: April 20 to May 20. 3. Gemini: May 2 1 to June 20. 4. Cancer: June 2 1 to July 22. 5. Leo: July 23rd to August 22nd. 6. Virgo: August 23rd to September 22nd. 7. Libra: September 23rd to June 22nd, 10. 8. Scorpio:101October 23rd to11October 2nd1. 9. Sagittarius:165438+1October 22nd to 65438+February 2nd1. 10, Capricorn: 65438+February 22nd to 65438+1October 19. 1 1, Aquarius: 65438+1from October 20th to February 18. 12, Pisces: February 19 to March 20th.