Look at the Schematic Diagram of the Revolution of the Earth and answer this question. (1) Mark the direction of the earth's revolution with a short line in the diagram. (2) When the sun shines direct

Look at the Schematic Diagram of the Revolution of the Earth and answer this question. (1) Mark the direction of the earth's revolution with a short line in the diagram. (2) When the sun shines directly on the Tropic of Cancer, its solar terms. The earth revolves around the sun at the same time, which is called earth revolution, and the direction of revolution is from west to east; As can be seen from the schematic diagram of the earth's revolution, when the earth revolves around A, the sun shines directly on the Tropic of Cancer, which is the summer solstice in the northern hemisphere; When the earth revolves around B, the sun shines directly on the equator, which is the autumn equinox in the northern hemisphere; When the earth revolves around c, the sun shines directly on the tropic of cancer, which is the winter solstice in the northern hemisphere; When the earth revolves around D, the sun shines directly at the equator, which is the vernal equinox in the northern hemisphere.

So the answer is: (1)

(2) Summer solstice; (3) Summer solstice; Vernal equinox; Solstice of winter; Vernal equinox