ATPL Navigation Practice Questions - CASA Airline Transport Pilot Licence (Aeroplane) - Navigation (ANAV) Exam

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Which of the following best describes the shape of the Earth and the relationship between its polar and equatorial diameters?

The Earth is an oblate spheroid, meaning its polar diameter is larger than its equatorial diameter by approximately 23 nautical miles. The Earth is a prolate spheroid, meaning its polar diameter is larger than its equatorial diameter by approximately 45 nautical miles. The Earth is an oblate spheroid, meaning its equatorial diameter is larger than its polar diameter by approximately 23 nautical miles (43 km). The Earth is a perfect sphere, meaning its equatorial and polar diameters are identical.

Correct Answer:

The Earth is an oblate spheroid, meaning its equatorial diameter is larger than its polar diameter by approximately 23 nautical miles (43 km).

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