NCERT Class 11 Geography Pratical Work in Geography: Chapter 3 — Latitude, Longitude and Time
This chapter introduces the fundamental concepts of latitude, longitude, and time in the context of practical geography. It explains that the Earth, an oblate spheroid, requires a network of imaginary lines – parallels of latitude and meridians of longitude – to accurately locate features on its surface. The equator is defined as the 0° latitude line, dividing the Earth into Northern and Southern Hemispheres. Meridians of longitude run north-south, joining the poles, with the Prime Meridian serving as the reference point. These geographical coordinates are measured in degrees, minutes, and seconds, providing a systematic way to determine location, distance, and direction. The chapter details how parallels of latitude are drawn and numbered, noting that the length of a degree of latitude is approximately constant.
Quick info
| Board | CBSE / NCERT |
|---|---|
| Class | Class 11 |
| Subject | Geography |
| Book | Pratical Work in Geography |
| Chapter | Chapter 3 — Latitude, Longitude and Time |
| Language | English |
| PDF type | NCERT Textbook |
| Session | CBSE 2026 |
| Reading time | 3 minutes |
| Word count | 490 |
Learning outcomes
- Understand the necessity of imaginary lines for locating places on Earth.
- Define and differentiate between parallels of latitude and meridians of longitude.
- Explain the role of the Equator and Prime Meridian.
- Describe how latitude and longitude are measured in degrees, minutes, and seconds.
- Recognize the Earth's shape as an oblate spheroid and its implications.
Vocabulary
| Word | Meaning |
|---|---|
| Oblate spheroid | A shape that is like a sphere but flattened at the poles and bulging at the equator. |
| Geographical grid | A network of intersecting lines (latitudes and longitudes) used to fix locations on Earth. |
| Parallels of latitude | Imaginary horizontal lines running east-west, parallel to the equator, measuring angular distance north or south of the equator. |
| Equator | The great circle midway between the North and South Poles, with a latitude of 0°. |
| Meridians of longitude | Imaginary vertical lines running north-south, joining the poles, measuring angular distance east or west of the Prime Meridian. |
| Prime Meridian | The meridian of longitude (0°) from which all other meridians are measured. |
| Degrees (°) | Unit of angular measurement used for latitude and longitude. |
| Minutes (') | A subdivision of a degree, equal to 1/60th of a degree. |
| Seconds (") | A subdivision of a minute, equal to 1/60th of a minute. |
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Practice questions
- Why is a network of imaginary lines needed on a globe or map? Answer: A network of imaginary lines is needed to provide a reference system for accurately locating various places and features on the Earth's surface.
- What is the Equator, and what is its significance? Answer: The Equator is the largest circle drawn midway between the North and South Poles, with a latitude of 0°. It divides the globe into two equal halves: the Northern Hemisphere and the Southern Hemisphere.
- How are parallels of latitude different from meridians of longitude? Answer: Parallels of latitude are horizontal lines running east-west and are parallel to the Equator, while meridians of longitude are vertical lines running north-south and join the two poles.
- What are the units used to measure latitude and longitude? Answer: Latitude and longitude are measured in degrees (°), minutes ('), and seconds (").
Practice MCQs
Q1. The Earth's actual shape is best described as:
Explanation: Due to rotation, the Earth bulges at the equator and is flattened at the poles, resembling an oblate spheroid.
Q2. Which line divides the globe into two equal halves?
Explanation: The Equator is the largest circle and is located at 0° latitude, dividing the Earth into the Northern and Southern Hemispheres.
Q3. Lines running north-south that join the two poles are called:
Explanation: Meridians of longitude are the vertical lines that connect the North and South Poles.
Q4. How many minutes are there in one degree of latitude or longitude?
Explanation: Each degree is further divided into 60 minutes, and each minute into 60 seconds.
Q5. The latitude of the North Pole is:
Explanation: The poles are located at 90 degrees north (North Pole) and 90 degrees south (South Pole) of the Equator.
Frequently asked questions
What is the primary purpose of latitude and longitude lines?
Latitude and longitude lines form a geographical grid that allows for the precise location of any point on the Earth's surface.
What is the difference between a great circle and a small circle on Earth?
A great circle divides the Earth into two equal halves (like the Equator), while a small circle divides it into two unequal halves (like all other parallels of latitude).
How is the Equator defined in terms of latitude?
The Equator is defined as the line of 0° latitude, located exactly midway between the North and South Poles.
What is the significance of the Prime Meridian?
The Prime Meridian (0° longitude) serves as the reference line from which all other lines of longitude are measured east or west.
Why are latitude and longitude measured in degrees, minutes, and seconds?
These units allow for precise measurement of angular distances, enabling accurate determination of locations on the Earth's surface.
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NCERT Class 11 Geography — Pratical Work in Geography — Chapter 3 — Latitude, Longitude and Time. Verified by NCERT Help Editorial Team. Reviewed on 29 Jul 2026. Last updated 10 Aug 2026.