Light determines solar terms

(1) As can be seen from the figure, at this time, the sun rays directly hit the tropic of Capricorn, which is the winter solstice in the northern hemisphere, and the time is around 65438+February 22nd.

(2) As can be seen from the picture, at this time, the sun is directly on the tropic of Capricorn, which is the winter solstice in the northern hemisphere, that is, the length of day and night in our school is the shortest and the longest.

(3) When the sun shines directly on the Tropic of Capricorn, the days are getting shorter and shorter from south to north in all parts of the earth, so among the three places A, B and C in the picture, the longest day is place C; However, the polar night occurs in the Arctic Circle.

So the answer is: (1) Tropic of Capricorn; Solstice of winter; (2) winter; The shortest day and the longest night; (3) extreme night; C.