CBSE Class 11 Geography: Latitude, Longitude and Time - NCERT Solutions

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NCERT Solutions PDF Class 11 PDF

This chapter, "Latitude, Longitude and Time," for CBSE Class 11 Geography, delves into the fundamental concepts of Earth's coordinate system. It explains the significance of latitude and longitude in determining locations and understanding time zones. The solutions cover essential topics such as the definition of a great circle, the role of poles as reference points, the concept of coordinates, the apparent movement of the sun, and the distinction between local time and time zones. This resource provides clear, step-by-step answers to the exercise questions, helping students grasp these crucial geographical principles and prepare effectively for their exams.

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Quick info

BoardCBSE
ClassClass 11
SubjectPractical Work in Geography
Session2026
LanguageEnglish
TypeNCERT Solutions
ChapterChapter 3

Chapter summary

Chapter 3 of the Class 11 Geography syllabus focuses on Latitude, Longitude, and Time. The NCERT Solutions provide detailed explanations for concepts like great circles, poles, geographical coordinates, and the reasons behind the apparent east-to-west movement of the sun. It also clarifies the difference between latitude and longitude and the concept of local time, aiding students in understanding Earth's spatial and temporal framework.

Learning outcomes

  • Understand the Earth's natural reference points: North and South Poles.
  • Define and identify a great circle, with the equator as a prime example.
  • Explain the concept of geographical coordinates (latitude and longitude).
  • Describe the reason for the apparent east-to-west movement of the sun.
  • Differentiate between latitude and longitude, noting their properties and measurements.
  • Define and understand the concept of local time.

Topics covered

Paper topics

  • Latitude
  • Longitude
  • Time
  • Great Circle
  • Poles
  • Geographical Coordinates
  • Local Time
  • Earth's Rotation
  • Apparent Movement of Sun
  • Latitude vs. Longitude

Important topics

  • Definition of Latitude and Longitude
  • Distinction between Latitude and Longitude
  • Concept of Great Circle
  • Geographical Coordinates
  • Local Time and Time Zones
  • Earth's Rotation and Apparent Solar Movement

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Questions and Solutions

Question 1 (i)

Answer the following questions in about 30 words: Which are the two natural points of references on the earth?
Solution: The two natural points of reference on the Earth are the North Pole and the South Pole. These points are defined by the Earth's axis of rotation, around which the planet spins from west to east.

Question 1 (ii)

What is a great circle?
Solution: A great circle is any circle drawn on the surface of the Earth that divides the planet into two equal hemispheres. The Equator is the most significant example of a great circle, being the largest one possible on Earth.

Question 1 (iii)

What are coordinates?
Solution: Coordinates, specifically geographical coordinates, refer to the system of latitudes and longitudes. This network of lines provides a systematic way to represent and determine the exact position of any feature or location on the Earth's surface.

Question 1 (iv)

Why does the sun appear to be moving from east to west?
Solution: The sun appears to move from east to west because the Earth rotates on its axis from west to east. This continuous rotation, which takes approximately 24 hours for one complete turn, creates the illusion of the sun traversing the sky.

Question 1 (v)

What is meant by local time?
Solution: Local time is the time observed in a specific place, determined by the position of the sun in the sky at that location, typically based on the meridian passing through it. It differs from the standardized time zone that a place might fall within.

Question 2

Distinguish between latitudes and longitudes.
Solution:

Latitudes and longitudes are both angular measurements used to define locations on Earth, but they differ in several key aspects:

  • Direction: Latitudes run horizontally from East to West, parallel to the Equator. Longitudes run vertically from North to South, converging at the Poles.
  • Measurement: Latitudes measure the angular distance north or south of the Equator, ranging from 0° at the Equator to 90° N at the North Pole and 90° S at the South Pole. Longitudes measure the angular distance east or west of the Prime Meridian, ranging from 0° to 180° E and 180° W.
  • Lines: Lines of latitude are parallel to each other, and the distance between them is relatively constant (approximately 111 km). Lines of longitude converge at the poles, meaning the distance between them is maximum at the Equator and decreases to zero at the poles.
  • Purpose: Latitudes are primarily used to demarcate temperature zones. Longitudes are primarily used to determine local time and establish time zones.

Activity 1

Find out the locations of the following places with the help of your atlas and write their latitudes and longitudes: Mumbai, Vladivostok, Cairo, New York, Ottawa, Geneva.
Solution: To complete this activity, you would need to consult a geographical atlas. The approximate latitudes and longitudes for the mentioned places are:
  • Mumbai: Approximately 19° N latitude, 73° E longitude.
  • Vladivostok: Approximately 43° N latitude, 132° E longitude.
  • Cairo: Approximately 30° N latitude, 31° E longitude.
  • New York: Approximately 41° N latitude, 74° W longitude.
  • Ottawa: Approximately 45° N latitude, 76° W longitude.
  • Geneva: Approximately 46° N latitude, 6° E longitude.
Note: These values are approximate and may vary slightly depending on the atlas used.

Common mistakes

  • Confusing the direction of Earth's rotation with the apparent movement of the sun.
  • Not clearly distinguishing the properties and measurement ranges of latitude and longitude.
  • Misunderstanding the definition and examples of a great circle.
  • Difficulty in grasping the concept of geographical coordinates for location determination.

Revision tips

  • Visualize the Earth's rotation to understand the sun's apparent movement.
  • Create a table to compare and contrast latitude and longitude characteristics.
  • Practice identifying great circles and understanding their significance.
  • Review the definitions of key terms like 'coordinates' and 'local time' regularly.

Practice MCQs

Q1. What are the two natural points of reference on the Earth?

Q2. Which of the following is an example of a great circle?

Q3. Why does the sun appear to move from East to West?

Q4. What do latitudes and longitudes collectively form?

Q5. Longitude is used primarily to determine:

Frequently asked questions

What are the key reference points on Earth mentioned in Chapter 3?

The two natural points of reference on Earth are the North Pole and the South Pole, established by the Earth's rotation on its axis.

How is a great circle defined in Geography?

A great circle is a circle drawn on the Earth's surface that divides the planet into two equal halves. The Equator is the most prominent example.

What is the purpose of geographical coordinates?

Geographical coordinates, formed by latitudes and longitudes, provide a systematic network to precisely represent and identify the location of any feature on the Earth's surface.

Why does the sun seem to move from East to West?

The sun appears to move from East to West because the Earth itself rotates on its axis from West to East, completing one rotation in 24 hours.

What is the difference between latitude and longitude?

Latitudes run East-West and measure distance north or south of the equator, while longitudes run North-South and measure distance east or west of the Prime Meridian. They differ in their direction, measurement, and application (temperature vs. time).

How can these NCERT solutions help in exam preparation?

These solutions offer clear, rewritten answers to all exercise questions, explaining concepts like latitude, longitude, and time in detail, which is crucial for understanding and scoring well in exams.

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