There are four quarters in a year. What months are these four quarters?

A year can be divided into four quarters, and each quarter lasts for three months.

1, the first quarter: 65438+1October-March.

2. Second quarter: April to June

3. Third quarter: July-September.

4. The fourth quarter: 65438+1October-65438+February.

In fact, the strict division should be: (according to the latitude of China)

1, the first quarter: March-May (spring)

2. The second quarter: June to August (summer)

3. Section III: September-165438+1October (autumn)

4. Section 4:12-February (winter)

Extended data:

The reasons for the formation of the first and fourth seasons

There is an included angle (23 26') between the earth's rotation axis and the earth's revolution plane around the sun (ecliptic plane). Therefore, when the earth revolves around the sun, the position of the direct sunlight on the earth will change from 23 26' south latitude to 23 26' north latitude, that is, the tropic of cancer.

When the sun shines directly, the heat and temperature on the earth's surface are high, which is summer; On the contrary, when the sun is tilted, the heat gained on the earth's surface is low, which is winter. When the sun shines directly into the northern hemisphere, it is summer in the northern hemisphere and winter in the southern hemisphere; On the contrary, when the sun shines directly into the southern hemisphere, it is summer in the southern hemisphere and winter in the northern hemisphere.

When the sun shines directly on the Tropic of Cancer, it is the winter solstice (around 65438+February 22nd) and the summer solstice (around June 22nd). When the sun shines directly at the equator, it is the vernal equinox (about March 2 1) and the autumnal equinox (about September 2 1).

Second, geographical phenomena.

The earth's orbit around the sun is elliptical and has an angle with the plane of its rotation. When the earth is in different positions in its orbit at different times of the year, different places on the earth receive different sunlight and different heat from the sun, so there are seasonal changes and differences between cold and hot.

In climate, the four seasons are distinguished by temperature. In the northern hemisphere, generally speaking, March-May is spring, June-August is summer, September-165438+1October is autumn, and12-February is winter.

In the southern hemisphere, the time of each season is just the opposite of that in the northern hemisphere. It is summer in the southern hemisphere and winter in the northern hemisphere; It is winter in the southern hemisphere and summer in the northern hemisphere. There is no obvious boundary between seasons, and the change of seasons is gradual.

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