The western hemisphere is a solar term in the night hemisphere.

The western hemisphere is the night hemisphere and the eastern hemisphere is the day hemisphere. The longitude range of the eastern hemisphere is 60 w-120 e, and the geographical coordinates of the direct point of the sun should be 30 E, 0.

When the direct point of the sun moves south, the southern hemisphere begins to enter summer and the northern hemisphere enters winter, so the solar term in the northern hemisphere at that time is the autumnal equinox, which is about September 23. Three months later, the solar term in the northern hemisphere is the winter solstice, which is about 65438+February 22. At this time, the direct point of the sun enters the tropic of Capricorn, and the distribution law of the global noon sun height angle gradually decreases from the tropic of Capricorn to the north and south, and the polar night appears in the Arctic.