Look at the schematic diagram of the earth revolution; (1) Write the names of solar terms at point A ... B.C.D.A _ _ _ _ B _ _ _ _ C _ _ _ _ D _ _ (2) When the sun is at the position of B.D.

When the earth revolves around the sun, the direct point of the sun's rays moves regularly between the tropic of cancer.

(1) According to the chart, A is the winter solstice; B is the vernal equinox; C is the summer solstice; D is the autumn equinox;

(2) When the earth moves to BD position, the direct point of the sun is on the equator, and the world is divided equally between day and night;

(3) When the earth moves to position C, the direct point of the sun is on the tropic of cancer, and it is summer in the northern hemisphere, with long days and short nights;

(4) When the earth moves to position A, the direct point of the sun is on the tropic of Capricorn, which is the winter solstice in the northern hemisphere, the seasons in the northern hemisphere are opposite, the southern hemisphere is summer (warm season), and the Antarctic circle has extreme days;

(5) The revolution direction of the earth is from west to east (counterclockwise).

Therefore, the answer is: (1) winter solstice; Vernal equinox; Summer solstice; Autumnal equinox; (2) the equator; Divide equally; (3) Tropic of Cancer; Summer; The days are long and the nights are short; (4) Tropic of Capricorn; Summer; Extreme day;

(5) .