Sextant
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A quadrant, sextant or octant is used to measure an object's angle above the horizon.
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Diagram of a marine sextant
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Sextant drawing
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a man holding a sextant
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Quadrant (Stark 1815)
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late 18th century sextant
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Plath sextant
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Sextant, compass and octant
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Sextant Navigational aid
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A midshipman takes a sextant reading aboard the frigate USS Badger (FF 1071).
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Details showing the scale and vernier on an early 19th c. octant
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Details showing the reverse side and ivory notepad on an early 19th c. octant
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Details showing the double-holed sighting pinnula on an early 19th c. octant
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Mid 20th c. sextant
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Britannia Yacht Club Sexstant