Solar revolutionary text

(1) The period of revolution of the Earth is one year, and the direction is from west to east;

(2) When the sun shines directly on the equator, it is the vernal equinox or autumnal equinox in the northern hemisphere; When the sun shines directly on the Tropic of Cancer, it is the summer solstice in the northern hemisphere; When the sun shines directly on the tropic of Capricorn, it is the winter solstice in the northern hemisphere;

(3) When the sun shines directly on the equator, it is the vernal equinox (about 2 1 year in March) or the autumn equinox (about September 23rd) in the northern hemisphere. The length of day and night in the northern hemisphere is equally divided. When the sun shines directly on the Tropic of Cancer, it is the summer solstice in the northern hemisphere (around June 22nd). At this time, the daytime in the northern hemisphere is the longest.

So the answer is: (1) one year; From west to east; (2)

; (3) March 2 1 and around September 23; Summer solstice.