Class 9 Exam > Class 9 Videos > Social Studies (SST) Class 9 > Longitude and time
Longitude and time Video Lecture | Social Studies (SST) Class 9
FAQs on Longitude and time Video Lecture - Social Studies (SST) Class 9
| 1. What is longitude and how is it measured? |  |
Ans. Longitude is a geographical coordinate that specifies the east-west position of a point on the Earth's surface. It is measured in degrees, with the Prime Meridian (0 degrees) passing through Greenwich, London. Longitude is measured using a device called a sextant, which uses the position of celestial bodies such as the Sun, Moon, or stars to determine the angle between the observer's location and the Prime Meridian.
| 2. What is the significance of longitude in determining time? | |
Ans. Longitude plays a crucial role in determining time as it helps establish different time zones around the world. Each degree of longitude represents 4 minutes of time difference. For every 15 degrees of longitude, there is a time difference of one hour. By knowing the longitude of a particular location, we can calculate the time difference from the Prime Meridian and determine the local time.
| 3. How does longitude affect the measurement of time during travel? | |
Ans. When traveling across different longitudes, the time changes due to the Earth's rotation. As we move eastward, the time becomes later, while moving westward makes the time earlier. This change in time is the basis for crossing time zones. For example, if we travel from London (GMT) to New York (GMT-5), we will experience a time difference of 5 hours, where New York's local time is 5 hours behind London.
| 4. How can longitude and time be used in navigation? | |
Ans. Longitude and time are essential for navigation, especially at sea. By using a chronometer (a precise timekeeping device), sailors can determine their longitude by comparing the local time with the time at the Prime Meridian. The time difference can then be converted into degrees of longitude, allowing sailors to pinpoint their location accurately on a nautical chart.
| 5. Are there any countries or regions that do not follow the time zone system based on longitude? | |
Ans. Yes, there are a few exceptions to the time zone system based on longitude. Some countries or regions, like China, have adopted a single time zone across their entire territory for administrative convenience. Similarly, some countries or regions may have chosen to adjust their time zones for economic or political reasons, deviating from the standard time zone boundaries based on longitude.
About this Video
6.9K Views
4.91/5
Rating
Jul 13, 2025
Last updated
Video Description: Longitude and time for Class 9 2025 is part of Social Studies (SST) Class 9 preparation.
The notes and questions for Longitude and time have been prepared according to the Class 9 exam syllabus.
Information about Longitude and time covers all important topics for Class 9 2025 Exam.
Find important definitions, questions, notes, meanings, examples, exercises and tests below for Longitude and time.
Introduction of Longitude and time in English is available as part of our Social Studies (SST) Class 9 for Class 9 & Longitude and time in
Hindi for Social Studies (SST) Class 9 course. Download more important topics related with notes, lectures and mock test series for
Class 9 Exam by signing up for free.
Description
Video Lecture & Questions for Longitude and time Video Lecture | Social Studies (SST) Class 9 - Class 9 full syllabus preparation | Free video for Class 9 exam to prepare for Social Studies (SST) Class 9.
Information about Longitude and time
Here you can find the meaning of Longitude and time defined & explained in the simplest way possible.
Besides explaining types of Longitude and time theory, EduRev gives you an ample number of questions to practice Longitude and time tests,
examples and also practice Class 9 tests.
Related Searches
Summary
,Free
,Previous Year Questions with Solutions
,video lectures
,ppt
,Viva Questions
,Important questions
,Exam
,study material
,Extra Questions
,MCQs
,past year papers
,Longitude and time Video Lecture | Social Studies (SST) Class 9
,shortcuts and tricks
,practice quizzes
,Longitude and time Video Lecture | Social Studies (SST) Class 9
,Semester Notes
,Objective type Questions
,mock tests for examination
,Longitude and time Video Lecture | Social Studies (SST) Class 9
,Sample Paper
;
Study Longitude and time on the App
Students of Class 9 can study Longitude and time alongwith tests & analysis from the EduRev app,
which will help them while preparing for their exam. Apart from the Longitude and time,
students can also utilize the EduRev App for other study materials such as previous year question papers, syllabus, important questions, etc.
The EduRev App will make your learning easier as you can access it from anywhere you want.
The content of Longitude and time is prepared as per the latest Class 9 syllabus.
|
© EduRev
|
Education Revolution
|
|
Signup to see your scores
go up within 7 days!
Access 1000+ FREE Docs, Videos and Tests
Takes less than 10 seconds to signup