Traditional Culture Encyclopedia - The 24 Solar Terms - Isn't it cold after 49? Isn't it cold after 49?
Isn't it cold after 49? Isn't it cold after 49?
In the northern area, March 9th is the coldest time of the year. This is because the winter solstice is the shortest day in a year, and the direct angle between the sun and the ground is the smallest. Moreover, due to the short sunshine time, the ground gets the least solar heat, so the daily heat budget deficit on the ground will gradually increase.
The maximum value is reached in March and September, which leads to the lowest temperature in March and September. After March 9, with the continuous increase of sunshine time and the increase of the angle between the direct sunlight angle and the ground, the heat absorbed by the ground will gradually increase, so April 9 will be warmer than March 9.
What's more, March 9th is a slight cold solar term, and April 9th is a severe cold solar term. According to the data of previous years, slight cold is colder than cold.
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