Spring equinox, summer solstice, autumn equinox, winter solstice, direct sunlight, polar day and night, north and south.

At the vernal equinox (around March 2 1) and the autumnal equinox (around September 23), the sun shines directly on the equator, and the world is divided into two parts, with sunrise at 6 o'clock and sunset at 18.

From the summer solstice (around June 22nd), the sun shines directly on the Tropic of Cancer, and it is extremely night in the Antarctic circle (66.5 degrees south latitude to 90 degrees south latitude) and extremely day in the Arctic circle (66.5 degrees north latitude to 90 degrees north latitude). The days in the northern hemisphere are long and the nights are short, while the days in the southern hemisphere are short and the nights are long.

In winter solstice (about 65438+February 2 1), the sun shines directly on the tropic of Capricorn, and it is extremely night in the Arctic Circle and extremely day in the Antarctic Circle. The southern hemisphere has long days and short nights, while the northern hemisphere has short days and long nights.

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