Earth and its Movements

Rotation: Day and Night

The Spinning Earth

Rotation is the spinning of the Earth on its imaginary axis, which is slightly tilted at 23.5∘23.5^{\circ}.
Image 1

Key Points

  1. Completes one rotation in 24 hours.
  2. Side facing the Sun has Day; side facing away has Night.
  3. Earth rotates from West to East.
  4. Rotation causes the Sun to appear to rise in the East.

Revolution: The Yearly Path

Journey Around the Sun

Revolution is the movement of Earth around the Sun in a fixed elliptical orbit.
Image 1

Key Points

  1. Takes 36514365\frac{1}{4} days to complete one trip.
  2. A Leap Year occurs every 4 years with 366 days.
  3. Moves at a speed of nearly 30 km/s30~km/s.
  4. This journey, combined with tilt, causes seasons.
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