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The two motions of Earth are ;-

  1. Daily (24 hours) axial rotation.

  2. Annual (1 year) orbital (revolution) about the Sun.

NB There are several other known movements of the Earth. they are ;-

  1. The angle of the Earth's axis varies between 28 degrees to 21 degrees. Currently at 23 degrees.

  2. The Earth's orbit about the Sun is an ellipsoid, that is an ellips that doesn't quite close up with each orbit, but slightly overlaps. This elliptical movement varies between nearly circular to a narrow ellipse.

  3. The Earth speeds up an slows down through space, because the Sun lies at one of the foci of the ellipse , NOT the centre. As a consequence, when nearer the Sun we moive faster, and when further away we move slower.

  4. Because of the Moon , the Earth 'wobbles' in and out of its orbital track.

Summing , we can say that the Earth 'dances' through space, with the Sun and Moon as partners.

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lenpollock

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1y ago

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