Our Earth completes one rotation in its orbit around the Sun every year, or 365 days. The amount of sunshine that each part of the Earth absorbs varies as the planet travels through space. This is due to the Earth's rotation axis' inclination. Because of this tilt, the Sun looks to the northern hemisphere for half of the year and to the southern hemisphere for the other half.
As a result, the earth's season shifts. The season in the northern hemisphere is the polar opposite of that in the southern hemisphere. Spring, summer, winter, and autumn are the four seasons that we observe during the year. Every season lasts three months, with summer being the warmest and winter being the coldest.
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infographic by: online.visual-paradigm.com