Is the constellation calculated by lunar calendar or Gregorian calendar?

According to the constellation of the solar calendar

Constellations are about western constellations. Western astrology mainly calculates the "personal astrolabe" as an explanatory basis according to the astrology at birth, such as the position of the sun, the moon and the five stars in the zodiac. We generally say: Aries, Taurus, Gemini, Cancer, Lion, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius and Pisces are all classifications of western astrology! All aspects of time calculation should be calculated according to the solar calendar (Gregorian calendar).

You are looking at 12 constellation (Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces), so it must be based on the Gregorian calendar (Gregorian calendar) birthday.