Look at the picture and answer. (1) Write down the solar terms: A _ _ _ _ _, B _ _ _ _ _, C _ _ _ _ _, D _ _ _ _. (2) When the earth revolves to position A, the sun shines directly.

(1) The earth keeps going around the sun, which is called the revolution of the earth. The direction of the revolution is from west to east, and the cycle is one year. The geographical phenomena are: ① the change of the length of day and night; ② the formation of four seasons;

(2) When the earth revolves around the sun, the direct point of the sun's rays regularly moves between the Tropic of Cancer within one year. When the sun shines directly at the equator, it is the vernal equinox (about 2 1 year in March) or the autumn equinox (about September 23rd) in the northern hemisphere. When the sun shines directly on the Tropic of Cancer, it is the summer solstice in the northern hemisphere (around June 22); When the sun shines directly on the tropic of Capricorn, it is the winter solstice in the northern hemisphere (around 65438+February 22).

Therefore, the answer is: (1) summer solstice; Vernal equinox; Solstice of winter; Autumnal equinox; (2) Tropic of Cancer; b； d； March 2 1 or so; Around September 23rd.