The deflection angle cannot be negative.

Sure! The declination angle, also called the declination of the sun, is the included angle between the equatorial plane of the earth and the connecting line between the sun and the center of the earth. The declination angle moves in the range of+23 26' and-23 26' with the annual cycle, which becomes the symbol of the season. On June 2 1 or 22 every year, the declination reaches the maximum value of+23 26', which is called the summer solstice. At noon that day, the sun was directly above the Tropic of Cancer, which was the longest sunshine time in the northern hemisphere and the shortest sunshine time in the southern hemisphere. In the Antarctic circle, the sun never sets, but in the Arctic circle, so there is relatively hot weather in the northern hemisphere and a colder climate in the southern hemisphere. Then the declination angle gradually decreases to zero on September 2 1 or 22, and the global day and night time is equal to the autumnal equinox. By 65438+February, 2 1 or 22, the declination decreases to the minimum value of-23 26, which is the winter solstice.