Is the constellation based on the lunar calendar or the solar calendar?

Constellations are calculated according to the solar calendar.

The Gregorian constellation originated from western astrology, and the calendar used in the west is the solar calendar, so it is the solar calendar, that is, the date that passes quickly. The twelve constellations come from the west. Because the west divides regions according to the constellations determined by the solar calendar, the constellations are calculated according to the solar calendar.