When the earth is at 1 point, the solar terms in the northern hemisphere are () a, vernal equinox b, summer solstice c, autumn equinox d and winter solstice?

Test center: the basic principle of the change of the length of day and night and the formation of four seasons: analysis: when the sun shines directly on the tropic of Capricorn, this day is called the winter solstice, which is 65438+February 22, and the days in the northern hemisphere are short and the nights are long, and the phenomenon of extreme night appears in the Arctic Circle; When the sun shines directly on the Tropic of Cancer, this day is called the summer solstice, that is, June 22nd. The northern hemisphere has long days and short nights, and the Arctic Circle has extreme days. When the sun shines directly on the equator for the first time, this day is called the vernal equinox, that is, March 2 1, and the world is divided equally between day and night; When the second ray of sunlight hits the equator directly, it is the autumnal equinox, that is, on September 23, the world is divided equally between day and night. At Earth 1 p.m., it is the summer solstice in the northern hemisphere, and the sun shines directly on the Tropic of Cancer. At this time, the days in the northern hemisphere are the longest and the nights are the shortest. According to the meaning of the question, B. Comments: This question examines the position of direct sunlight in different seasons, and you can look at the picture to answer it.