Is the constellation calculated by solar calendar or lunar calendar? On what basis did you calculate it?

Because the constellation is a western culture, of course, it is based on the solar calendar (that is, the time recognized by the world-Gregorian calendar).

There are twelve stars in China's words, which is based on the time of the lunar calendar. Constellations are calculated according to the solar calendar. The lunar calendar is only available in China, and the solar calendar is also called Gregorian calendar, which is universal in the world. Constellation is a foreign saying, and of course it is calculated according to the Gregorian calendar.