December 12, 2009 is a special day
In ancient China, there were 12 earthly branches to record time, order, etc., And Hai ranked 12th. The 10 Heavenly Stems and the 12 Earthly Branches are used cyclically, which is the ancient Chinese calendar method, with a cycle of 60 years. Each earthly branch is paired with 12 animals to form the twelve zodiac signs, and the 12th zodiac sign is the pig. A year is divided into twenty-four solar terms and 12 earthly branches. Daily timekeeping is also expressed by the earthly branches, so there are 12 hours in a day, starting from Zi hour, which is equivalent to 23:00 the day before to 01:00 today.
The modern Western calendar, used internationally, divides the year into 12 months. Each of the 12 months has different lengths, but they all have 12 days, namely January 12, February 12, March 12, April 12, May 12, June 12, July 12, August 12, September 12, October 12, November 12 and December 12.
A day is divided into 24 hours, with 12 hours each in the morning and 12 hours in the afternoon. In one day, the hour hand of the clock will rotate twice on the dial divided into 12 hours. The length of the minute hand is slightly equal to 1.5 Times that of the hour hand, and its running speed is 12 times that of the hour hand.