Is the zodiac calculated by the lunar calendar or the solar calendar?

Is the zodiac calculated by the lunar calendar or the solar calendar?

According to the chronology in fortune telling, the zodiac is counted from the date of beginning of spring.

For example, beginning of spring in 1989 is February 4th.

Born before beginning of spring, he should belong to the dragon.

Born after beginning of spring, it should be a snake.

According to the method of pushing the year in fortune telling, beginning of spring is always regarded as the beginning of a new year.

No matter what method is used, the lunar beginning of spring must be strictly defined as the boundary of one year. If beginning of spring was born in the first month, use this year's dry branches; Although he was born in the first month, but the time was before beginning of spring (not yet beginning of spring), then he was born in the year before, and the trunk of the year before served as the annual column. By the same token, although both of them were born in December of the lunar calendar, beginning of spring's former life took this year as the main branch, while beginning of spring's later life will continue to the next year.