Why does the earth have seasons?
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We have seasons because the distance between the sun and Earth changes throughout the year.
We have seasons because Earth's axis is tilted.
We have seasons because Earth's axis is tilted.
The main reason why the Earth has seasons is because its axis is tilted. The Earth's axis is an imaginary line that runs through its North and South poles. Instead of being perpendicular to the plane of its orbit around the sun, the Earth's axis is tilted at an angle of about 23.5 degrees.
As the Earth orbits the sun, different parts of the Earth receive varying amounts of sunlight at different times of the year. When a particular hemisphere, either the Northern or Southern hemisphere, is tilted towards the sun, it receives more direct sunlight and experiences summer. This is because the tilted surface of the Earth receives the sun's rays over a smaller area, which results in more concentrated heat and longer daylight hours.
On the other hand, when a hemisphere is tilted away from the sun, it receives indirect sunlight, and this leads to cooler temperatures and shorter daylight hours, resulting in winter. The other two seasons, spring and autumn, occur during the transition periods when the Earth is neither tilted towards nor away from the sun.
Therefore, it is the combination of the Earth's axial tilt and its orbit around the sun that creates the variations in sunlight and temperature, giving rise to the seasons we experience.