Birthdays have a fixed algorithm. Here is a brief introduction. The easiest way is to query the perpetual calendar, but the perpetual calendar generally only provides heavenly stems and earthly branches for the year, month and day.
The earthly branch of the hour is fixed. The birth chain starts at 23: 00-1, ends at 1 -3, ends at 3: 00 -5, ends at 5: 00 -7: 00, ends at 7: 00 and ends at 9: 00-1. 15-17 is the application time, 17-19 is the unitary time, 19 -2 1 is the time, and 2 1 -23 is the time.
By analogy, the sky dryness of one hour should be calculated according to the sky dryness of that day, that is, the sky dryness of that day multiplied by 2 minus 1 and then divided by 10. For example, on June 9, 2005, the stem of "Day" was "D", ranking fourth in the stem, so the stem of that day was 4*2- 1=7, and the remainder after dividing by 10 was 7, and the order of twelve branches was sub, ugly and ugly.
Origin of birthday
Birthday is actually another way of saying "four pillars" in Zhouyi. The four pillars refer to the time when a person was born, that is, year, month, day and hour. When people use "heavenly stem" and "earthly branch" to represent year, month, day and hour respectively, such as Jiazi Year, Shen Bingyue, Xin Ugly Day and Renyin Time. There are two words in each column and eight characters in four columns, so fortune telling is also called measuring eight characters. According to the relationship between yin and yang attributes and the five elements of heaven and earth, it is inferred that human body is responsible and blessed.
Archaeological findings show that in the late Shang Dynasty, a piece of Oracle bone of Emperor Di Yi was engraved with 60 complete Oracle bones, which may be the calendar at that time. This also shows that in the Shang Dynasty, the dry calendar was already in use. According to textual research, there was a solar eclipse in Lu Yingong in the Spring and Autumn Period from February (February 720 BC 10). This is more exact evidence that China used the date of the dry branches from the company. The use of the emperor's title and title is the title of Jianyuan in the period of Emperor Wu of the Han Dynasty.