Is the constellation according to the solar calendar or the lunar calendar?

Constellations are calculated according to the solar calendar, such as Aries March 2 1 to April 19, Taurus April 20 to May 20, Gemini May 2 1 to June 20, Cancer June 2 1 to July 2 1, and July 22.

The origin of constellations

Mesopotamian astrologers divided the starry sky into several regions for the convenience of studying and observing many stars in the sky, and each region was a constellation. It's hard to say clearly when humans began to have the concept of constellation. This astronomical knowledge was known long before there was a historical record. The name of the constellation probably comes from the sailors who sailed early.

The origin of constellations may be completely different between civilizations in different regions, but with the expansion and mutual influence of civilizations, the culture of constellations also includes the process of integration.