What causes the change of seasons?

Seasonal changes are caused by the rotation of the earth.

First, the basic characteristics of the earth's revolution

1, definition: the revolution of the earth refers to the movement of the earth around the sun.

2. Revolution direction: The revolution direction of the earth is from west to east.

3. period of revolution: The period of revolution of the Earth is a sidereal year (6: 09 on 365:10 second).

Second, the four seasons change.

1, the causes of the four seasons: due to the temporal and spatial changes of the length of day and night and the height of the sun at noon, the solar radiation changes regularly with the seasons.

2, the division of the four seasons

Astronomical season: summer refers to the season with the longest day and the highest sun in a year; Winter refers to the season with the shortest days and the least sunshine in a year.

The division of four seasons in many countries in the northern temperate zone: March, April and May are generally spring, and so on, and a season is divided every three months.

Third, how to distinguish the vernal equinox from the autumnal equinox

1, vernal equinox: the solar term in which the direct point of the sun enters the northern hemisphere from the southern hemisphere and passes through the equator; Autumnal equinox: solar term in which the direct point of the sun enters the southern hemisphere from the northern hemisphere and passes through the equator.

2. The scope of five zones: the degree of the Tropic of Cancer = the degree of the intersection of yellow and red; Degree of polar circle = 90 degrees-degree of intersection angle.

3. Determine whether there are direct phenomena and the scope of extreme day and night phenomena.

There is direct sunlight between the Tropic of Cancer and the Tropic of Cancer; There are extreme days and nights in the south and the Arctic Circle. ?