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Revision Notes

Keeping Time with the Skies

CBSE · Class 8 · Science

Quick revision notes for Keeping Time with the Skies — CBSE Class 8 Science. Key concepts, formulas, and definitions for last-minute revision.

44 questions76 flashcards5 concepts

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Key Topics to Revise

1

1. Moon Phases and Their Causes

  • The Moon is Earth’s natural satellite.
  • The Moon does not produce its own light; it shines by reflecting sunlight.
  • Only one half of the Moon always faces Earth, but the visible bright part changes because the Moon revolves around Earth.
2

2. Day, Month, and Year

  • The apparent daily motion of the Sun is due to Earth’s rotation on its axis.
  • The mean solar day is the average time the Sun takes to go from its highest position on one day to its highest position on the next day.
  • A mean solar day is 24 hours.
3

3. Types of Calendars

  • Calendars are built from natural cycles of the Sun and the Moon.
  • A lunar calendar is based on Moon phases.
  • Twelve lunar months make about 354 days.
4

4. Festivals and Astronomical Phenomena

  • Many Indian festivals are linked to Moon phases and are based on lunar or luni-solar calendars.
  • Diwali falls on the new Moon of Kartika.
  • Holi falls on the full Moon of Phalguna.

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Full Notes

Key Concepts

The mean solar day isThe Moon does not make itsWhen the bright part ofThe Moon takes about 29Earth takes nearly 365

Frequently Asked Questions

What are the important topics in Keeping Time with the Skies for CBSE Class 8 Science?
Keeping Time with the Skies covers several key topics that are frequently asked in CBSE Class 8 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in Keeping Time with the Skies — CBSE Class 8 Science?
Understand the core concepts first, then work through the 44 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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