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Chapter Summary

International Date Line

Maharashtra Board · Class 9 · Geography

Summary of International Date Line for Maharashtra Board Class 9 Geography. Key concepts, important points, and chapter overview.

45 questions20 flashcards4 concepts

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Overview

The International Date Line (IDL) is an imaginary line that runs roughly along the 180° meridian in the Pacific Ocean. It serves as the boundary where each new day begins on Earth. This chapter explores how the IDL was established, why it's necessary, and how it affects global timekeeping and travel

Key Concepts

Earth rotates 360° in 24 hours

Earth rotates 360° in 24 hours from west to east. This means the eastern parts of Earth are ahead in time compared to western parts. As Earth rotates,

The 180° meridian is the theoretical

The 180° meridian is the theoretical line opposite to the Prime Meridian (0°). The IDL is based on this meridian but deviates from it to avoid dividin

When traveling westward across the IDL

When traveling westward across the IDL, you add one day to the date. When traveling eastward across the IDL, you subtract one day from the date. The d

The IDL was established in 1884

The IDL was established in 1884 under American professor Davidson's leadership with representatives from many nations. It was created as an internatio

Learning Objectives

  • Understand the concept and purpose of the International Date Line
  • Learn how Earth's rotation affects time zones and date changes
  • Explain why the IDL is not a straight line like the 180° meridian
  • Analyze the practical applications of IDL in modern transportation and communication
  • Calculate time and date changes when crossing the IDL

Frequently Asked Questions

What are the important topics in International Date Line for Maharashtra Board Class 9 Geography?
International Date Line covers several key topics that are frequently asked in Maharashtra Board Class 9 board exams. Focus on the core concepts listed on this page and practise related questions to build confidence.
How to score full marks in International Date Line — Maharashtra Board Class 9 Geography?
Understand the core concepts first, then work through the 45 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 12 chapters — Maharashtra Board Class 9 Geography Chapter Summary

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