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A quadrant, sextant or octant is used to measure an object's angle above the horizon.

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   Using the sextant to measure the altitude of the sun
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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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  Stamp of the Faroe Islands 1994.
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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