The constellation calculates the number of days like this.

Taurus (4.2 1-5.20)

Gemini (5.2 1-6.2 1)

Cancer (6.22-7.22)

Leo (7.23-8.22)

Virgo (8.23-9.22)

Libra (9.23- 10.22)

Scorpio (10.23-11.21)

Sagittarius (11.22-12.438+0)

Capricorn (12.22-1.19)

Aquarius (1.20-2. 18)

Pisces (2. 19-3.20)

If you want to calculate which constellation you are

They are all based on the Gregorian calendar, which is the Gregorian calendar.