(2) On the summer solstice, the sun is directly above the Tropic of Cancer.

(3) According to the figure, polar day occurs within the Arctic Circle, and polar night occurs within the Antarctic Circle.

(4) On the summer solstice, the day is longer and the night is shorter in the Northern Hemisphere.

(5) Spring in the Northern Hemisphere is March, April and May, summer is June, July and August, fall is September, October and November, and winter is December, January and February.

The answers are:

(1) June 22;

(2) Tropic of Cancer;

(3) Polar day;

(4) Longer days and shorter nights;

(5) Summer.