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sighting instrument

См. также в других словарях:

  • sighting — sight ► NOUN 1) the faculty or power of seeing. 2) the action or fact of seeing someone or something. 3) the area or distance within which someone can see or something can be seen. 4) a thing that one sees or that can be seen. 5) (sights) places… …   English terms dictionary

  • Octant (instrument) — Octant. This instrument, labelled Crichton London, Sold by J Berry, Aberdeen, appears to have an ebony frame with ivory scale, vernier and signature plate. The index arm and mirror supports are brass. Rather than use a sighting telescope, this… …   Wikipedia

  • Quadrant (instrument) — Ptolemy using a quadrant A quadrant is an instrument that is used to measure angles up to 90°. It was originally proposed by Ptolemy as a better kind of astrolabe.[1] Several different variations of the instrument were later produced by medieval… …   Wikipedia

  • Nocturnal (instrument) — A nocturnal as costume jewellery. This is a functioning nocturnal, though only about 5 cm tall. It shows the month ring on the outside in brass. The silver coloured inner disk shows the time and has an indicator on one edge. By setting the… …   Wikipedia

  • Pelorus (instrument) — In appearance and use, a pelorus resembles a compass or compass repeater, with sighting vanes or a sighting telescope attached, but it has no directive properties. That is, it remains at any relative direction to which it is set. It is generally… …   Wikipedia

  • Red dot sight — A red dot sight (also called a reflex sight or, for certain models, a reflex scope) is a non magnifying firearm sight that uses an illuminated reticle, typically in the form of a red dot. [cite journal |url=http://findarticles.com/p/articles/mi… …   Wikipedia

  • History of astronomy — History of science …   Wikipedia

  • Egyptian astronomy — begins in prehistoric times. The presence of stone circles at Nabta Playa dating from the 5th millennium BCE, show the importance of astronomy to the religious life of Egypt even in the prehistoric period. The annual flooding of the Nile meant… …   Wikipedia

  • armillary sphere — [är′mə ler΄ē] n. [< L armilla, armlet, bracelet < armus: see ARM2] an ancient astronomical sighting instrument representing the great circles of the horizon, the ecliptic, the meridian, etc …   English World dictionary

  • firefinder — ˈ ̷ ̷ˌ ̷ ̷ ̷ ̷ noun : a device consisting of a map and a sighting instrument for determining (as from a fire tower) the location of a forest fire …   Useful english dictionary

  • Backstaff — Not to be confused with Ballastella. Davis quadrant from the beginning of the 18th century The backstaff or back quadrant is a navigational instrument that was used to measure the altitude of a celestial body, in particular the sun or moon. When… …   Wikipedia

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