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Latitudes and Longitudes

ICSE · Class 9 · Geography

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

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A diagram illustrating the Earth's grid system, showing how parallels of latitude and meridians of longitude intersect to form a grid used for locating points on Earth. It should clearly show the Equa
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Key Topics to Revise

1

Earth's Grid System and Basic Concepts

  • Earth is an oblate spheroid (geoid) - flattened at poles, bulged at equator
  • Equatorial circumference: approximately 40,075 km
  • Earth divided into 4 hemispheres: Northern, Southern, Eastern, Western
2

Latitudes - Horizontal Lines

  • Latitude = angular distance north/south of Equator measured from Earth's center
  • Range: 0° (Equator) to 90°N (North Pole) and 90°S (South Pole)
  • Total 180 parallels: 90 north + 90 south of Equator
3

Five Main Parallels and Climate Zones

  • Equator (0°): Divides Earth into Northern and Southern Hemispheres
  • Tropic of Cancer (23½°N): Sun overhead on June 21 (longest day in NH)
  • Tropic of Capricorn (23½°S): Sun overhead on December 22 (longest day in SH)
4

Longitudes - Vertical Lines

  • Longitude = angular distance east/west of Prime Meridian
  • Range: 0° (Prime Meridian) to 180° (International Date Line)
  • Total 360 meridians: 180° east + 180° west of Prime Meridian

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Full Notes

Key Concepts

A complete network of parallelsThe angular distance of a placeEquator (0°)The angular distance of a placeThe local time of the Prime

Frequently Asked Questions

What are the important topics in Latitudes and Longitudes for ICSE Class 9 Geography?
Key topics in Latitudes and Longitudes include Earth's Coordinate System Overview, Complete Latitude and Longitude System Overview, Earth's Grid System Overview. These are the concepts ICSE Class 9 examiners draw on most — study them first, then practise related questions.
How to score full marks in Latitudes and Longitudes — ICSE Class 9 Geography?
Start by understanding all key concepts. Practise previous year questions from this chapter. Revise formulas and definitions regularly. Use flashcards for quick revision 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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