What is the meaning of today's eight-character Wu Jia Yi Hai Wu Jia Jia Zi?

Heavenly stems and earthly branches was used to represent time in ancient times. Ten days and twelve branches are the year of Jiazi. This year is a year, and January is Mao, Chen, Si, Wu, Wei, Shen, You, Xu, Hai, Zi and Ugly Moon. Similarly, the days are exactly the same as the old calendar, one day 12 hours, 650.