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Rotation and Revolution

ICSE · Class 9 · Geography

Quick revision notes for Rotation and Revolution — ICSE Class 9 Geography. Key concepts, formulas, and definitions for last-minute revision.

53 questions34 flashcards5 concepts

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A diagram illustrating Earth's rotation on its axis, showing the illuminated half (day) facing the Sun and the shadowed half (night) away from the Sun, with the 'Circle of Illumination' clearly marked
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Key Topics to Revise

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1. Movements of the Earth

  • The two primary movements of Earth are rotation and revolution.
  • Rotation is the movement of Earth on its axis from west to east once in 24 hours.
  • Revolution is the movement of Earth around the Sun in approximately 365 1/4 days.
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2. Rotation and the Cycle of Day and Night

  • Rotation causes day and night.
  • At any moment, the side of Earth facing the Sun has day, and the opposite side has night.
  • The Circle of Illumination is the imaginary line that separates day from night on Earth.
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3. Effects of Rotation

  • Rotation creates centrifugal force, which acts away from the axis of rotation.
  • Centrifugal force causes a bulge at the Equator.
  • This force balances centripetal force.
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4. Revolution, Distance from the Sun, and Speed

  • Earth revolves around the Sun in an elliptical orbit.
  • The mean distance between Earth and the Sun is about 150 million km.
  • Earth is in perihelion on January 3, when it is closest to the Sun at about 147 million km.

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Full Notes

Key Concepts

The Earth rotates on its axisThe Earth revolves around the SunThe Earth’s axis makes an angleThis is the imaginary lineThis apparent force is created due

Frequently Asked Questions

What are the important topics in Rotation and Revolution for ICSE Class 9 Geography?
Key topics in Rotation and Revolution include Earth's Movements and Their Effects, Earth's Motions and Effects - Complete Overview, Earth's Movements and Their Effects. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Rotation and Revolution — ICSE Class 9 Geography?
Understand the core concepts first, then work through the 53 practice questions available for this chapter. Revise formulas and definitions regularly, and use flashcards for quick recall before the exam.

Sources & Official References

Content is aligned to the official syllabus. Refer to the board website for the latest curriculum.

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All 18 chapters — ICSE Class 9 Geography Revision Notes

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