The spinning Earth
Lesson 3 / 8
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I can describe the motions of Earth to explain day, night and a year, and describe the motion of the Moon to explain why it appears to change shape.
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Earth is a planet. It is a sphere that spins once every 24 hours.
Earth's spin explains day and night.
Earth orbits the Sun, with each orbit taking 365.25 days (1 year).
Earth orbits the Sun in an almost perfect circle.
The Moon orbits the Earth about once per month (27.3 days), this explains why the Moon appears to change shape.
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