Read the schematic diagram of the revolution of the earth and answer the following questions. 1) When the earth revolves to position ①, this day is _ _ _ _ _ _ _ _ (solar terms) in the northern hemisp

Read the schematic diagram of the revolution of the earth and answer the following questions. 1) When the earth revolves to position ①, this day is _ _ _ _ _ _ _ _ (solar terms) in the northern hemisphere, and the sun shines directly. When the earth revolves around the sun, the axis of the earth and the orbital plane form a fixed inclination of 66.5, which makes the direct point of the sun's rays move regularly between the tropic of cancer in a year.

(1) According to the diagram, when the earth revolves to position ①, the direct point of the sun is on the equator, which is the vernal equinox of the northern hemisphere, and the time is around March 2 1;

When the earth revolves to ② position, the direct point of the sun is on the tropic of cancer, which is the solstice of summer in the northern hemisphere, and the time is around June 22nd.

(2) Combined with the diagram: during the movement of the earth from position ②-③-④, the direct sunlight point moves from the Tropic of Cancer to the Tropic of Capricorn; During the movement of the earth from position ④-①-②, the northern hemisphere transits from winter to spring, and then to summer. Jiujiang, located in the northern hemisphere, will gradually get longer during the day and shorter at night.

So the answer is: (1) vernal equinox; Equator; Summer solstice; Tropic of Cancer; (2) Tropic of Capricorn; The days are getting longer and the nights are getting shorter and shorter.