Earth and its Relation with the Sun
Earth and its Relation with the Sun
Rotation of the Earth
⇒ The Earth spins (rotates), west to east on its axis once in 24 hours approximately.
⇒ The Earth’s axis is not vertical. It makes an angle of 23°30′ with the vertical or 66°30′ with the plane of the Earth’s orbit.
⇒ The Earth’s axis always remains pointed in the same direction (towards the Pole Star) as the Earth moves around the Sun. The tilt of the Earth’s axis is known as the inclination of the Earth’s axis.
⇒ Movements of tides are mostly determined by rotation of the Earth.
Sidereal day: The period of time during which a star describes a complete circle in its apparent journey around the pole star, representing the period of one rotation of the earth on its axis and equal to 23 hours 56 minutes 4 seconds. It is thus about 4 minutes shorter than the mean solar day.
Solar day: The average period taken by the earth in making one rotation on its axis in relation to the sun-24 hours.
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