Solar Altitude Angle of Summer Solstice and Winter Solstice in Guangzhou

Guangzhou is bounded by the Tropic of Cancer (23 degrees and 27 minutes), in the south of Conghua and in Huaxian County. In the area south of this line, the sun crosses the zenith twice from summer to noon around the year. Even on the solstice in winter, the noon sun altitude angle in Guangzhou is above 42 degrees and 37 minutes, and the sun altitude angle is relatively large, and the total solar radiation and sunshine hours are sufficient.

The solstice in summer and the solstice in winter are two landmark points in the 24 solar terms. The summer solstice is generally on June 2 1 or 22, and the winter solstice is 65438+February 2 1 or 22, with a difference of half a year. The summer solstice has the longest sunshine time in the northern hemisphere, while the winter solstice, on the contrary, has the shortest sunshine time.

In the northern hemisphere, generally speaking, after the summer solstice, the weather will accelerate. Generally, it begins to enter the dog days after 10, that is, the coldest time of the year after the winter solstice, and counting nine begins after the winter solstice. As the saying goes, it is hot in dog days and cold in three or nine days, which is directly related to the solstice in summer and the solstice in winter.