Is the constellation calculated by solar calendar or lunar calendar? Some people say it's a solar calendar, others say it's a lunar calendar.

The solar calendar, also called Gregorian calendar, was introduced into China from western countries. The earth revolves around the sun once a year. Constellation prediction was introduced to China from western countries, so it is based on the solar calendar.

The lunar calendar is the lunar calendar, also known as the lunar calendar and the monthly calendar. We working people set the time according to the moon's profit and loss, and every month 15 is a full moon. The forecast of our country is mainly based on the five elements. There is no lunar calendar in western countries, so the constellation forecast was introduced to China from western countries.