Read "Schematic Diagram of the Earth's Revolution" and answer the following questions (1). When the earth revolves to position A, it is in the _ _ _ _ _ _ (solar terms) in the northern hemisphere, and

Read "Schematic Diagram of the Earth's Revolution" and answer the following questions (1). When the earth revolves to position A, it is in the _ _ _ _ _ _ (solar terms) in the northern hemisphere, and the sun is direct. (1) When the earth revolves to position A, the sun shines directly at the equator, which coincides with the vernal equinox in the northern hemisphere, and the time is around March 2 1.

(2) When the earth revolves to position B, the sun shines directly on the Tropic of Cancer, which coincides with the summer solstice in the northern hemisphere, and the time is around June 22nd, with the longest day and the shortest night in Dongguan in the northern hemisphere.

(3) When the earth revolves to position C, the sun shines directly at the equator, which coincides with the autumn equinox in the northern hemisphere, and the time is around September 23rd; Therefore, on June 24, 20 12, China's Shenzhou-9 manned spacecraft successfully docked with Tiangong-1 manually. On that day, the earth was in orbit around the sun, roughly between BC in the above picture.

So the answer is: (1) vernal equinox; Equator; (2) The days are long and the nights are short; (3)B； C.