Why should constellations be calculated according to the solar calendar?

Foreigners don't have such a thing as a lunar calendar.

The way they remember the year is the Gregorian calendar.

According to the solar calendar, there is no lunar calendar abroad.

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). Chinese astrology is based on twenty-eight nights (see twenty-eight nights in Sanyuanli) or twelve o'clock and the dividing line, observing the sky and its area, so as to predict the events that will happen in the state and country on the ground corresponding to this area; Divining the fate of the emperor and his family, China's astrology is called Wei Zi's fortune (I'm not very proficient in China's astrology, which may be ambiguous. They are calculated according to the lunar calendar. Therefore, the most important thing to explain is. If you look at the constellation 12 (Aries, Taurus, Gemini, Cancer, Leo, Virgo, Libra, Scorpio, Sagittarius, Capricorn, Aquarius, Pisces), you must take the birthday of the Gregorian calendar as the basis.