Read the schematic diagram of the earth's revolution and answer: (1) Write the solar terms in the northern hemisphere when the earth revolves to positions A and B: A______, B _ _ _ _ _.

(1) Solar terms in the northern hemisphere when the earth revolves to positions A and B: A is the summer solstice, and B is the winter solstice;

(2) When the earth revolves to position A, the latitude of direct sunlight is 23.5 N, and there is an extreme day in the Arctic Circle;

(3) The shortest day in a year in Shandong Province is 65438+February 22nd or 65438+February 23rd;

(4) The direction of the earth's revolution around the sun is from west to east;

(5) As can be seen from the figure, when the earth rotates, its axis is inclined and its spatial orientation remains unchanged;

(6) Due to the revolution of the earth, the temperate zone has obvious seasonal changes.

Therefore, the answer is: (1) summer solstice; Solstice of winter;

(2)23.5N； Extreme day;

(3) 12; 22; 12; 23;

(4)

(5) inclined; Constant;

(6) season.