The Earth has seasons because it is tilted on its axis as it orbits the Sun. This tilt is about 23.5 degrees, and it plays a very important role in how sunlight reaches different parts of the planet.
As the Earth moves around the Sun, different hemispheres receive more or less direct sunlight at different times of the year:
When the Northern Hemisphere is tilted toward the Sun, it receives more direct sunlight. This results in summer, with longer days and warmer temperatures.
At the same time, the Southern Hemisphere is tilted away from the Sun, receiving less direct sunlight. This causes winter, with shorter days and cooler temperatures.
Six months later, the situation reverses, so the Southern Hemisphere experiences summer while the Northern Hemisphere experiences winter.
It is important to understand that seasons are not caused by the Earth being closer or farther from the Sun. In fact, the Earths orbit is nearly circular, so distance does not change enough to create seasons.
Instead, the angle of sunlight is the key factor. When sunlight hits the ground more directly, it concentrates heat and warms the surface more. When it arrives at a slant, the same energy is spread over a larger area, making it less intense.
In short, seasons happen because of Earths tilt and motion around the Sun, not changes in distance.
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