Earth rotation throttling device

(1) As can be seen from the schematic diagram of the earth's revolution, when the earth is in position A, the sun is on the tropic of cancer, which is the summer solstice in the northern hemisphere, and the date is around June 22nd. When the earth is in position B, the latitude of direct sunlight is tropic of Capricorn, which is the winter solstice in the northern hemisphere, and the date is about 65438+February 22;

(2) When the earth revolves to position A, extreme daylight appears in the Arctic Circle.

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

(4) When the direct point of the sun moves northward, it lies between the winter solstice and vernal equinox.

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

(2) extreme day;

(3) as shown in the figure: (4) b; Spring Equinox