One year is the amount of time it takes Earth to - Complete one revolution
Explanation:
The two most important motions of the Earth in space are:
- Rotation: this is the motion of the Earth around its axis. The Earth completes one rotation around its axis in 24 hour. This motion of rotation is what causes the alternation between day and night in different parts of the Earth: the part of the Earth that is facing the Sun is in day time, while the other part is in night time.
- Revolution: this is the motion of the Earth around the Sun. The Earth follows an elliptical orbit around the Sun (almost circular), and completes one full orbit in 365 days, or one year.
Therefore, one year is the amount of time it takes Earth to
- Complete one revolution
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