Wherever the earth turns, Zhejiang is the autumnal equinox.

As shown in the figure below, when the earth revolves to position C in the figure, it is the vernal equinox of Zhejiang Province. The four positions in the picture are vernal equinox, and the sun shines directly on the equator; On the solstice of winter, the sun shines directly on the tropic of Capricorn; On the third vernal equinox, the sun shines directly on the equator; On the solstice of summer, the sun shines directly on the Tropic of Cancer.

The vernal equinox is one of the 24 solar terms, and the vernal equinox is the midpoint of 90 days in spring, which is generally around 2 1 every year. The direct point of the sun is on the equator, and the world is divided equally day and night. In the time period, it refers to the position where the sun is located between 0 and 15, that is, from March 20th to April 5th. But in fact, it usually refers to the day when the sun is really at 0 degrees of the yellow meridian: March 20 or March 2 1.