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Solving Earth Surface Distance Problems: Great Circle Method

Learn to find the shortest distance on Earth's surface using the concept of great circles. Calculate distances between points like (37°N, 126°E) and (37°N, 54°W). Understand how to apply angular measurements for accurate results.

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Solving Earth Surface Distance Problems: Great Circle Method

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  1. EARTH AS A SPHERE 9.4 Understand and use the concept of distance on the surface of the earth to solve problems

  2. Learning Outcomes Find the shortest distance between two points on the surface of the earth.

  3. A B (37oN, 126o E) (37oN, 54o W)

  4. A B

  5. A B (37o N, 126o E) (37o N, 54o W) 180o Answer

  6. The distance between A and B = 180o x 60’ = 10 800 nautical mile

  7. A B

  8. A B AOB 37o 37o 0o O Next

  9. AOB = 180 – (37o x 2) = 106o Back

  10. The distance between A and B = 106o x 60’ = 6 360 nautical mile

  11. Conclusion The shortest distance from one point to another on the surface of the earth is along a great circle.

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