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Why does Earth have 24 hours in a day?

Our Earth has two distinct motions: rotation and revolution. Earth rotates on its own axis and this motion is known as its rotation. Earth also moves around the Sun and this motion is known as its revolution. Earth undergoes both motions simultaneously. It is the Earth's rotation that is responsible for day and night on the planet. We experience day time when our geographical region is facing the Sun and when it is not (due to Earth's rotation), we experience night time. Earth takes about 24 hours to complete one rotation and hence our days are 24 hours long. 


The revolution of Earth around the Sun, along with Earth's axial tilt, is the reason we have seasons. Earth takes about 365 days to complete one revolution, which is also the length of our year.


Hope this helps. 

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