What month is the zodiac based on?

The zodiac of each month is based on the official calendar of December, as shown below:

Yin Jian is a tiger in the first month, and Maojian is a rabbit in February.

In March, Chen Jian was a dragon, and in April, Chen Jian was a snake.

May is a horse, June is not a sheep.

In July, Shen Jian was a monkey, and in August, Jianyou was a chicken.

Jian Xu is a dog in September and a pig in October.

In November, Jianzi is a rat, and in December, Jianugly is a cow.

The traditional moon building is based on the calendar month of the main branch, because the bucket building takes a year as the cycle, which is consistent with the return year of the earth's activities around the sun. The calendar takes solar terms as the key link, that is, silver moon starts from beginning of spring to Jingzhe, and so on.

Extended data:

Twelve earthly branches: in the trunk calendar, a year is divided into twelve days, and the "sword" represents the direction of the top of the bucket handle of the Big Dipper; In ancient astronomy, bucket handle and the Big Dipper were called "swords". During the year, bucket handle was rotated, which successively referred to "Twelve Chens" and was called "December Sword" (or "December Order").

December is a sunny month based on twenty-four solar terms, which is different from the lunar month (Wang Shuo, divided into the first fifteen grades) and has twelve branches, such as Jiazi, Jianchou and Yin Jian.

Baidu encyclopedia-dizhi