Constellations are divided according to the birthdays of the solar calendar (new calendar, Gregorian calendar) of the year of birth.
The following is the date division table of constellations. Compare the birthday of the solar calendar with the one below and you will know what constellation it is.
Aries (03/2 1-04/20)
Taurus (04/2 1-05/20)
Gemini
Cancer (22 June 2006-22 July 2007)
Leo (07/23-08/22)
Virgo (08/23-09/22)
Libra (09/23- 10/23)
Scorpio (10/24-11/22)
Sagittarius (11/23-12/21)
Capricorn (12/22-0119)
Water bottle: 0 1/ 20- 02/ 18
Pisces (02/ 19- 03/20)