What's the difference between cold weather and winter solstice?

1. Cold weather:

The severe cold day is the last of the 24 solar terms. Like the slight cold solar term, it is a solar term that reflects the degree of cold weather.

2. Winter solstice:

Winter is also called Solstice Festival, because it is a festival of the arrival of the cathode, the beginning of the sun and going south to the sun. Because the New Year is just around the corner after the solstice in winter, there is a saying that winter festivals are as big as a year.

Second, the time:

1. Severe cold day: the sunset of severe cold falls on 65438+1October 20th every year.

2. Winter solstice: Winter solstice falls on 65438+February 2 1, 22 or 23 every year.

Extended data

Related background:

Our country is going through a process of change. At the earliest, it was determined that the winter solstice should be no less than two hours. Later, the relevant departments found that this standard is difficult to achieve in some cities because of the high latitude and dense urban buildings. Therefore, in the latest revised standard, a cold day was changed as the date to determine the sunshine time.

Winter solstice is the shortest sunshine day in a year, so it will be set as the reference date for measuring sunshine standards by relevant departments. According to the observation, the noon sun height in the area of 40 north latitude is 27 degrees from winter to Sunday, and it rises to 30 degrees in the severe cold day.

According to astronomical theory, the higher the sun is, the shorter the shadow is, and the more sunlight shines on the ground. In other words, in cold days, the sun shines more sunlight on the ground than in winter solstice.

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