Look at the picture and answer this question. (1) When the earth moves to the ④ position, the solar terms in a year are _ _ _ _ _ _ _ _ _ _ _ _ _ _ _.

(1) According to the schematic diagram of the earth's revolution, when the earth moves to position ④, the sun shines directly on the Tropic of Capricorn, and the solar term in a year is winter solstice. At this time, the extreme solar phenomenon appears at Kunlun Station in Antarctica.

(2) From the schematic diagram of the earth's revolution, when the earth moves to position ②, the sun shines directly on the Tropic of Cancer, which is the solstice in the summer of the year. Changsha in the northern hemisphere has long days and short nights.

(3) From the schematic diagram of the earth's revolution, it can be seen that when the earth moves to the position ③, the sun shines directly at the equator, which is the autumnal equinox of the year, and the time is around September 23rd, and the world is divided equally between day and night. On the National Day of 65438 10 +65438 10 +0, the earth moved closest to ③.

Therefore, the answer is: (1) winter solstice; Extreme day; (2) Tropic of Cancer; The days are long and the nights are short; (3)③; Divide equally.