Variation Law of the Earth's Noon Sun Height Angle from the Equilibration Line to vernal equinox

At the vernal equinox (about 2 1 March), the sun shines directly on the equator, and the sun's altitude angle at noon in the equatorial region is 90 degrees, and other places decrease from south to north with latitude.

During the summer solstice (around June 22nd), the sun shines directly on the Tropic of Cancer, and the midday sun elevation angle near the Tropic of Cancer is 90 degrees, while the midday sun elevation angle in other parts of the world decreases from the Tropic of Cancer to the north. In the Tropic of Cancer and its north, the solar altitude angle at noon reaches the maximum value in a year, and the latitude in the southern hemisphere reaches the minimum value in a year. Extreme day appears in the North Pole and extreme night appears in the South Pole.

The autumnal equinox (around September 23rd) is the same as the vernal equinox.

During the winter solstice (around 65438+February 22nd), the sun shines directly on the Tropic of Capricorn, and the midday sun elevation angle near the Tropic of Capricorn is 90 degrees, and the midday sun elevation angle in other parts of the world decreases from the Tropic of Capricorn to the north. . At the tropic of Capricorn and its south, the midday sun height angle reaches the maximum value in a year, and at all latitudes in the northern hemisphere, the midday sun height angle reaches the minimum value in a year. Extreme day appears in the South Pole and extreme night appears in the North Pole.