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What is meaning of Great Circle Sailing ?

Great circle sailing involves the solution of courses, distances, and points along a great circle between two points. Great Circle Sailing is used for long ocean passages. For this purpose, the earth is considered a perfect...

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What is Twilight , its types in detail?

Twilight is the period of incomplete darkness before sunrise and after the sunset. So the morning twilight ends at sunrise, when the upper limb of the sun just appears above the visible horizon, and evening twilight starts at...