The sun watches the movement.

1. First of all, it is an instant that the sun shines directly on the earth. The earth is always in motion, so is the point of direct light. Light does not go straight to a fixed latitude all day. You can find the moving speed of the direct point of the sun-there is 46 52' from the Tropic of Capricorn to the Tropic of Cancer, so 46 52' ÷ 365 ≈ 7 42 ". On June 2 1 or 22 every year, the sun reaches 90 degrees of the yellow meridian, which is the summer solstice solar term; The exact time of the summer solstice this year is 7: 09 on June 2 1 Sunday, Beijing time.

2. Secondly, the day hemisphere and night hemisphere of the earth at any moment are equal to half of the earth's surface, so the spherical factor must be considered. Because the sun is far away from the earth and huge, it regards sunlight as parallel. The following figure is a direct view of the summer solstice. The sun's rays are parallel, one in the northern hemisphere and one in the southern hemisphere on the morning line. At this time, the sun is in the northeast of these two places.

With reference to the light chart of winter solstice, can it be concluded that the sunrise direction in Beijing and Cape Town is southeast?

3. The apparent motion diagram of the sun reflects the movement track of the sun seen by the observer in the sky during the day, which is consistent with the reality. At the same time, it is suggested that you carefully observe the sunrise and sunset direction of your residence during the summer vacation to enhance your actual understanding and memory.