How does Chinese astrology work?

12:Chinese Astrology have 12 signs

60:It has 60 sub-categories (sub-shenxiao),making a 60-year cycle.

Year and hour:Chinese zodiac signs are used to record years and hours.

Sequence:The sequence of the 12 signs/animals is decided by a Great Race.Different versions:Each country has their own 12 signs of Chinese Zodiac/astrology.

Three:3 countries share the same Chinese astrology signs:China,Japan,Korea.