Solar revolution solar terms

(1) From the signal of the earth's revolution, I can see that when the earth revolves to the place A, the sun points directly at the Tropic of Cancer, which is the summer solstice in the northern hemisphere, and when the earth revolves to the place B, the sun points directly at the equator, which is the autumnal equinox in the northern hemisphere;

(1) As can be seen from the signal of the earth's revolution, when the earth revolves to point A, the sun shines directly on the Tropic of Cancer, which is the summer solstice in the northern hemisphere. At this time, the change of the length of day and night in Xiangyang city should be that the day is long and the night is short, and the extreme day phenomenon appears in the Arctic Circle.

(3) As can be seen from the signal of the earth's revolution, when the earth revolves to position B, the sun shines directly at the equator, which coincides with the autumn equinox in the northern hemisphere, and the time is around September 3. When the earth revolves to position C, the sun shines directly on the tropic of Capricorn, which coincides with the winter solstice in the northern hemisphere, and the time is around the National Day (1 0) in June.

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

Therefore, the answer is: (1) summer solstice; Vernal equinox; (i) Tropic of Cancer; The days are long and the nights are short; Extreme day; (3) BC; (4).