Sextant
From Wikimedia Commons, the free media repository
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 |
 Sextant drawing |
 a man holding a sextant |
 Quadrant (Stark 1815) |
 late 18th century sextant |
 Plath sextant |
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 Sextant, compass and octant |
 Sextant Navigational aid |
 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 |
 Details showing the reverse side and ivory notepad on an early 19th c. octant |
 Details showing the double-holed sighting pinnula on an early 19th c. octant |
 Mid 20th c. sextant |
