Axial Tilt Planet Earth as we all know and live in has seasons, and the reason behind this is because of the fact that earth has a tilt (c...
Axial Tilt
Planet Earth as we all know and live in has seasons, and the reason behind this is because of the fact that earth has a tilt (called as 'Axial Tilt', which is at an angle around 23.5°) in its rotational axis (which is around 24 hours, forming a day) and is directly co-related with the revolution around the Sun in its orbit (which is around 365 days, to make an year).
Today, the Earth's axis is tilted 23.5 degrees from the plane of its orbit around the sun. But this tilt changes. During a cycle that averages about 40,000 years, the tilt of the axis varies between 22.1 and 24.5 degrees. Source: NASA
Seasons
While revolving around the Sun in its orbit, Earth experiences different sunlight exposure in an year, at any given point on its surface due to axial tilt. As the exposure of sunlight creates difference in temperature throughout the day, it also varies around the year thereby the energy difference creates movement of air as wind, and evaporated water as cloud. Seasons such as summer, winter, autumn/rainy and spring/fall are a result of this one factor of axial tilt, without which there would be no seasons and hence a negative environment for basis of life.
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