12 is the zodiac based on the lunar calendar or the solar calendar?

The zodiac is used by China people to record the year, and the common method of dating in China is what we call the lunar calendar. In order to facilitate memory, 12 species of animals were selected and calculated in combination with heavenly stems and earthly branches. Therefore, people in China, to be exact, Han people all have zodiac signs, because they can calculate their birth years.