Do the twelve constellations refer to the Gregorian calendar or the lunar calendar?

Constellations were introduced to China from the west. There is no such thing as lunar calendar in the west, so the twelve constellations are divided by solar calendar.

The solar calendar is the date when the solar calendar is compared with the lunar calendar of the year when you were born.

Everyone has only one sign of their own.

Hehe ~ ~ I hope you are satisfied ~ ~