Beginning of autumn sun direct point

In beginning of autumn, the direct point of the sun is 135? Beginning of autumn is the 13 solar term among the 24 solar terms, and the first solar term in autumn, which falls on August 7 -9 of the Gregorian calendar every year. At this time, the bucket handle of the Big Dipper points southwest, and the sun reaches longitude 135? .

Direct solar point

The direct point of the sun is the point where the incident angle of sunlight on the earth's surface is 90 degrees, and it is the intersection of the connecting line between the center of the earth and the sun and the spherical surface of the earth.

At the vernal equinox, the direct point of the sun is at the equator, and then it moves northward until it reaches the Tropic of Cancer on June 22nd. ? On the summer solstice, the direct point of the sun is on the tropic of cancer, and then it moves south until it reaches the equator on September 23.

At the autumnal equinox, the direct point of the sun is at the equator, and then it continues to move south until it reaches the Tropic of Capricorn on February 22, 65438. From winter to the sun, the direct point of the sun is on the tropic of cancer, then it moves north and returns to the equator on March 2 1 day.