International Date Line And Great Circles | Geography NCERT | UPSC Prelims and Mains 2023
The International Date Line (IDL) is an imaginary line running from the North Pole to the South Pole that separates two calendar days. The IDL roughly follows the 180° line of longitude and passes through the Pacific Ocean. In some places, this line appears as zig-zag, deviating to the meridian’s east or west.
When one crosses the IDL, one either gains or loses a day depending on which way they are traveling. When one moves from the East of the IDL to the West of the IDL, a day is lost and vice-versa.
Great Circle is a circle on the surface of a sphere which lies in a plane passing through its centre. As it represents the shortest distance between any two points on a sphere, a great circle of the earth is the preferred route taken by a ship or aircraft for navigation.
Geography is a very important subject in the UPSC exam for both IAS Prelims and Mains papers. Geography for UPSC covers Indian Geography as well as World geography. Physical Geography, Human Geography, Environmental Geography are broadly covered under by the UPSC Syllabus.
Through the Geography Essentials series, BYJU'S Exam Prep IAS aims to cover the most important topics from Geography for UPSC in great detail.
Watch the video for all that you need to know about the International Date Line and Great Circles, strictly from the perspective of the UPSC Civil Services Examination. Subscribe to our KZread channel for more informative video lectures and quizzes to help you crack UPSC 2024.
Key topics discussed:
1. What is International Date Line?
2. Importance of International Date Line?
3. Is the International Date Line straight?
4. Why is the IDL not a straight line?
5. What are great circles?
6. Why do we study great circles?
7. Are all longitudes a part of the great circles?
8. Which latitudes are great circles?
9. Why is the path along the Great circle, the shortest?
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#earth #geography #upscgeography
#internationaldateline #idl #easternhemisphere #westernhemisphere #greatcircles #latitudes #longitudes #smallcircles #dateline #primemeridian #cse #ncertsummary #geographysummary #byjusias
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Without visual representation this concept is quite complex to comprehend. Thanks Team BYJU'S
@BYJUSIAS
11 ай бұрын
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This video is topnotch! These visual explanation videos are a game changer
perfect video to start day with top notch quality content and information. Thank You
Wow! The animation made me understand everything. Thank you!
superb
Just amazing like a lightning
Best thing in the video is i didn't got irritated by any ads. Very good initiative.
@BYJUSIAS
11 ай бұрын
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This animation made everything simple
Thank you sir for this great vedio
@BYJUSIAS
11 ай бұрын
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Clear my all doubts regarding IDL ❤
@BYJUSIAS
Жыл бұрын
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such an easy explanation of the complex topic thanks team byjus
@BYJUSIAS
10 ай бұрын
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Best way to understand Geography ❤
@BYJUSIAS
11 ай бұрын
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many new concepts I have learnt from all these videos... Thank you so much sir 🙏🙏
@BYJUSIAS
11 ай бұрын
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Superb explanation sir. Great effort ❤❤❤❤❤❤❤❤
@BYJUSIAS
11 ай бұрын
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one of my favourite geography teacher..... thank you so much sir
@BYJUSIAS
11 ай бұрын
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Very interesting
@BYJUSIAS
11 ай бұрын
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Very well explained.. thank you very much..
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10 ай бұрын
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Super explation sir 🎉🎉🎉 especially the summary helped me a lot 🎉🎉🎉
@d.joshitha5101
22 күн бұрын
Thankyou team Byjus 🎉🎉🎉
Your explanation was great sir
@BYJUSIAS
11 ай бұрын
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It is not so hard and not so easily but this task needs continuity
Super presentation
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11 ай бұрын
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Thank you topic is clear 🇮🇳🙏
@BYJUSIAS
10 ай бұрын
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Thanks Mukesh jha sir
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5 ай бұрын
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Thank you sir
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11 ай бұрын
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thank you sir 🙏
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8 ай бұрын
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Thank you sir!
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Жыл бұрын
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Tq so much sir👏👏
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8 ай бұрын
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Is video se Better kuch ho hi nahi sakta....
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6 ай бұрын
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Thank you sir
@BYJUSIAS
11 ай бұрын
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