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Questions and Answers
Which motion of the earth is responsible for the occurrence of day and night?
Which motion of the earth is responsible for the occurrence of day and night?
- Rotation (correct)
- Revolution
- Both rotation and revolution
- None of the above
What is the angle between the axis of the earth and its orbital plane?
What is the angle between the axis of the earth and its orbital plane?
- 90°
- 45°
- 66½° (correct)
- 60°
What is the name of the circle that divides the day from night on the globe?
What is the name of the circle that divides the day from night on the globe?
- Circle of orbit
- Circle of rotation
- Circle of illumination (correct)
- Circle of revolution
How long does it take for the earth to complete one rotation around its axis?
How long does it take for the earth to complete one rotation around its axis?
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What is the daily motion of the earth called?
What is the daily motion of the earth called?
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Study Notes
Earth's Motions
- The rotation of the earth is responsible for the occurrence of day and night.
Earth's Axis
- The angle between the axis of the earth and its orbital plane is 23.5 degrees.
Day-Night Boundary
- The circle that divides the day from night on the globe is called the circle of illumination.
Rotation Period
- It takes 24 hours for the earth to complete one rotation around its axis.
Daily Motion
- The daily motion of the earth is called diurnal motion.
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