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John Hadley
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John Hadley
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Articles about John Hadley
Sextant
The sextant is a hand-held optical instrument that measures the angle between two visible objects - classically between a celestial body and the sea horizon - and was the navigator's primary tool for fixing latitude and longitude at sea. Its doubly reflecting …
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SextantThe sextant is a hand-held optical instrument that measures the angle between two visible objects - classically between a celestial body and the sea horizon - and was the navigator's primary tool for fixing latitude and longitude at sea. Its doubly reflecting …