When did the first frost come this year? How is the date of the first frost calculated?

The twenty-four solar terms are the product of the wisdom of the ancient people in China. They guide people's daily life and farming laws and make great contributions to the inheritance of the Chinese nation. Today, we will learn about the first frost in the 24 solar terms.

There is a poem in ancient times:? A leaf knows the first frost, and the autumn rain is deep? . The first frost is the18th solar term and the last solar term in autumn. After the first frost, the weather became cold, the air became dry, everything lost its vitality and gradually became dim. Therefore, the first frost is regarded by many people as a node symbol from autumn to winter. After this day, the weather became cold, the temperature difference between day and night was large, and the yang gradually converged. Everyone began to pay attention to cold and warmth.

The arrival of the first frost means that autumn is already deep. This year's first frost was set at123 October, that is, yesterday. After only a few hours, everyone probably obviously felt the sudden drop in temperature yesterday.

So how is the date of the first frost calculated?

Next, I will provide you with the calculation method: the calculation formula of the first frost date: [y * d+c]-L.

Interpretation of the formula: Y= two digits after the number of years, D=0.2422, L= leap year, 2 1 century C=23.438, and 20th century C=24.2 18.

For example, the first frost date in 2088 = [88? 0.2422+23.438-[88/4] = 44-22 = 22,65438+1the first frost on October 22nd.

Exception: calculation result in 2089 plus 1 day.

Also use this formula to calculate the first frost time in 2020:

The first frost date in 2020 = [20? 0.2422+23.438-[20/4] = 28-5 = 23,65438+1the first frost on October 23rd.

Persimmons and chrysanthemums are very popular in the first frost of this day. After all, tomorrow is the Double Ninth Festival.

The first frost is deep in autumn, which is the most beautiful time in the whole autumn. Wan Li's red maple leaves, warm breeze, crisp autumn air and clear sky are good opportunities for travel and play. However, everyone should also pay attention to protect their bodies and put on their coats to avoid the invasion of cold.