Why is the height angle of the sun the largest from winter to the sun?

Because the sun shines directly on the tropic of Capricorn from winter to the future, the sun moves south, and the sunlight depends on the position of the sun. As the sun moves northward in winter, the direct point of the sun will also move northward, so China is in the northern hemisphere, so the days are short and the nights are long in winter.

Because the earth's axis is inclined, the length of day and night varies in different parts of the earth. At the north and south poles of the earth, the sun is oblique all year round, and the length of day and night changes the most. In the high latitudes of the northern and southern hemispheres, there will be a phenomenon that the sun never sets or stays out all day, that is, it is day or night all the time, which is the phenomenon of "extreme day" and "extreme night" in the polar regions. In the north and south poles, there are extreme days and nights for half a year.

Extended data:

Solar term time

Pointing to the bucket, the longitude of the sun is 270, which is the solstice in winter. The first month is the first month, November is the second month, and the winter solstice is the 22nd of the 24 solar terms. The winter solstice usually falls on 65438+February 2 1 or 65438+February 22 in the Gregorian calendar. For example, the specific time of winter solstice in 2020: 65438+February 2 1, 18: 02. ?

Note: The average time method (used before 1645) does not consider the uneven speed of the sun moving on the ecliptic, which is different from the constant gas method (used since 1645), and the specific intersection time of each solar term is also different.

Astronomically, the "winter solstice" is the turning point of the sun's southward movement. In winter, the earth is located near the perihelion, and its running speed is slightly faster, which leads to that the time of direct sunlight in the southern hemisphere is about 8 days shorter than that in the northern hemisphere in a year, so the winter in the northern hemisphere is slightly shorter than that in summer.