Summer solstice sunshine time and winter solstice sunshine time

Summer solstice (summer solstice) June 2 1 or the 22nd of each year is the summer solstice. On this day, the sun's direct position on the ground reaches the northernmost point of the year, almost directly on the Tropic of Cancer (23 26' 28 ÷ 44 north latitude), and the daytime in the northern hemisphere is the longest, and the farther north it is, the longer it is. The days from sunrise to sunset in southern China are mostly around fourteen hours. Although summer solstice has the longest day and the highest angle of the sun, it is not the hottest time of the year. Because at this time, the heat near the surface continues to accumulate and does not reach the maximum. As the saying goes, "It's hot in dog days", and the real hot summer weather is calculated according to the summer solstice and beginning of autumn. From mid-July to mid-August, the temperature is the highest in all parts of China.

Winter solstice (winter solstice)

The winter solstice is a very important solar term in the China lunar calendar [1], and it is also a traditional festival of the Han nationality in China. Until now, there are still many places that have the custom of winter solstice. The winter solstice is commonly known as "winter festival", "long festival" and "year-divided". As early as more than 2,500 years ago in the Spring and Autumn Period, China has used the Earth to observe the sun to determine the winter solstice, which is the most important of the 24 solar terms.

The winter solstice is the year with the shortest day and the longest night in the northern hemisphere. After the solstice in winter, the days will get longer day by day. After the winter solstice, the climate in all parts of the country has entered the coldest stage, which is what people often say. There is a folk saying in China that "cold is in nine, heat is in three".

According to modern astronomical science, the sun shines directly on the tropic of Capricorn from the winter solstice, and the sun is most inclined to the northern hemisphere, which has the shortest day and the longest night. After this day, the sun gradually moved to the north.