What causes seasons on Earth?

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A SEASON is a division of the year marked by changes in weather, ecology and the amount of daylight. In temperate and polar regions, the seasons are marked by changes in the intensity of sunlight that reaches the Earth’s surface.
But have you ever wondered, what causes these seasons to happen in a particular time of the year?

The occurrence of seasons is caused by the Earth’s tilt. The Earth does not revolve around the Sun on a perpendicular axis. It is tilted at an angle of 23.5 degrees relative to our orbital plane. Because of this tilt, the northern hemisphere faces the sun for the first half of the year and faces away from it during the second half.

During the second half, the southern hemisphere is oriented towards the sun.
The halves can then be further divided into two more halves, giving us a total of four seasons. Two when the northern hemisphere faces the sun and two when the southern hemisphere does.