Which is the real constellation, the solar calendar or the lunar calendar?

Gregorian constellations are calculated according to the solar calendar, because the zodiac constellations in western astrology are defined according to the solar cycle. The solar calendar is an international date calendar, with 365 days a year and a boudoir year every four years, so the solar calendar accurately reflects the changes of the four seasons. At the same time, the calculation method of solar calendar has also been internationally recognized. The start and end dates of these constellations are determined according to the solar calendar.