# I Ching Algorithm: Nine Stars of the Month, Nine Stars of the Hour

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This article considers the Nine Stars of the Month and the Nine Stars of the Hour. As for the Day, the determination of the Nine Stars is relatively complicated and the calculation that has been handed down so far is wrong, so we will build the Nine Stars of the Day in a separate article.

24 weather periods
The Sun moves in the Zodiac exactly one round is a 365.25-day weather year. Divide the zodiac circle 360 ​​degrees into 12 arcs, each of them 30 degrees. The start time of each arc with one weather period, is counted as the beginning of a weather month.
In the middle of each arc, that is, between each month, is one middle period.
Total 24 periods, we have the following table:

The calendar dates of the weather periods in the table above are for 2021. These dates change only from 1 to 2 days annually.

Nine Stars of the Month
The Nine Stars of the Month starts from the month of Jia-Rat of the first year, that is, the year of Jia-Rat of the era of stems and branches with White One - Water Star qi field, following the decreasing direction of the number of Luoshu. Since the year is "Tiger First", first month is the month of the Tiger. From the month of the Rat, the Nine Stars takes two steps to the month of the Tiger, so the Nine Stars of the month of the Tiger is the White Eight - Earth Star. Qi field repeats after 9 steps, month repeats after 12 steps. The least common multiple of 9 and 12 is 36. Therefore, the 1st month will return to White Eight - Earth Star after 36 months ie 3 years. From the year of the Rat, 3 years away is the year of the Rabbit, 3 years from now will be the year of the Horse, 3 years from now will be the year of the Cock.
Thus, the first month of the years of the Rat-Horse-Rabbit-Cock belongs to White Eight - Earth Star. Similarly, the first month of the Dragon-Dog-Ox-Sheep years belongs to the Yellow Five - Earth Star; The first month of the Tiger-Monkey-Snake-Pig years belong to Black Two - Earth Star.
We have remarked that every 3 years, the nature of the year repeats cyclically. In terms of the year's Nine Stars, every 3 years the Luoshu table has the same matrix determinant similar to the 3 Fortunes cycle. Thus, the years of the Rat-Horse,-Rabbit-Cock have the same characteristics and belong to the same group. Similarly, the years of the Dragon-Dog-Ox-Sheep also belong to a group, and so do the years of the Tiger-Monkey-Snake-Pig.
In terms of the Earthly Branch, the Tiger-Monkey-Snake-Pig is the 4 sectors of the Horse, the Rat-Horse,-Rabbit-Cock is the 4 sectors of Fail, and the Dragon-Dog-Ox-Sheep is the 4 sectors of Grave. The laws in different aspects are closely related logically.
Below is the Nine Stars table of the months of the years

Now is the "Autumn starts" period in the 7th month, this year is the year of the Ox, looking up the table, the Nine Stars of the month are White Eight - Earth Star

The Earth Qi of the month emphasizes the Earth Qi of the Year and Fortune's, and Southeast Asian countries suffer heavy losses due to Covid this month, especially in specific polluted areas.

The Nine Stars of the Hour
The Nine Stars of the Hour are divided into two periods of the year, the first half of the year is in the forward direction, ie in the increasing direction of the Luoshu number, and the last half of the year is in the opposite direction:
• From the Winter solstice to the end of the "Grain in ear" period: Cuu Tinh goes in the forward direction
• From Summer solstice to the end of "Great snow" period: Cuu Tinh goes in the backward direction
The Hour has also the 12-step repetition cycle like the Month so we have the following table

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