Rotation and Revolution

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The two main movements of the Earth are rotation and revolution. Rotation is the spinning of the Earth on its axis, and revolution is the movement of the Earth around the Sun in a fixed path.

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Rotation is the movement of the Earth on its axis from west to east once in 24 hours. It causes day and night. The Earth also turns through 360 degrees in 23 hr 56 min 4.09 sec, which is called the si…

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Day and night occur because the Earth rotates on its axis. The side facing the Sun has day, and the side away from the Sun has night. As the Earth keeps turning, different places move into sunlight an…

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The circle of illumination is the imaginary line that clearly separates day from night on the Earth. It shows the boundary between the sunlit half and the dark half of the Earth.

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The Sun appears to rise in the east and set in the west because the Earth rotates from west to east. The Sun is not moving around the Earth in this way; the apparent movement is caused by Earth's rota…

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The sidereal day is the time taken by the Earth to rotate once relative to the stars. It is 23 hr 56 min 4.09 sec, which is almost four minutes shorter than the solar day because of the Earth's orbita…

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The Coriolis effect is the apparent force caused by the Earth's rotation that deflects moving objects. It turns moving bodies to the right in the Northern Hemisphere and to the left in the Southern He…

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The Coriolis effect was first described in 1835 by Gustave Coriolis, a French scientist.