octant mirror

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• 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

• Reflecting instrument — Reflecting instruments are those that use mirrors to enhance their ability to make measurements. In particular, the use of mirrors permits one to observe two objects simultaneously while measuring the angular distance between the objects. While… …   Wikipedia

• Sextant — This article is about the sextant as used for navigation. For the astronomer s sextant, see Sextant (astronomical). : For the history and development of the sextant see Reflecting instruments A sextant is an instrument generally used to measure… …   Wikipedia

• John Hadley — Infobox Scientist name = John Hadley box width = image width =150px caption = John Hadley birth date = birth date|1682|4|16 birth place = 1682 Bloomsbury, London death date = death date and age|1744|2|14|1682|4|16 death place = East Barnet,… …   Wikipedia

• History of the telescope — The earliest known working telescopes appeared in 1608 and are credited to Hans Lippershey and Zacharias Janssen, spectacle makers in Middelburg, and Jacob Metius of Alkmaar. The design of these early refracting telescopes consisted of a convex… …   Wikipedia

• Tholian — Star Trek race|if= bgcolor=#ffffff Name=Tholian Caption=A Tholian, as depicted in Planet=Tholia BaseOperations=Tholia Affiliation=Tholian AssemblyTholians are a starfaring and extremely territorial race in the Star Trek fictional universe. The… …   Wikipedia

• Cartesian coordinate system — Illustration of a Cartesian coordinate plane. Four points are marked and labeled with their coordinates: (2, 3) in green, (−3, 1) in red, (−1.5, −2.5) in blue, and the origin (0, 0) in purple. A Cartesian coordinate system specifies each point… …   Wikipedia

• sextant — /sek steuhnt/, n. 1. an astronomical instrument used to determine latitude and longitude at sea by measuring angular distances, esp. the altitudes of sun, moon, and stars. 2. (cap.) Astron. the constellation Sextans. [1590 1600; < L sextant (s.… …   Universalium

• Celestial navigation — Celestial navigation, also known as astronavigation, is a position fixing technique that was devised to help sailors cross the featureless oceans without having to rely on dead reckoning to enable them to strike land. Celestial navigation uses… …   Wikipedia

• History of navigation — In the pre modern history of human migration and discovery of new lands by navigating the oceans, a few peoples have excelled as sea faring explorers. Prominent examples are the Phoenicians, the ancient Greeks, the Persians, the Arabians, the… …   Wikipedia

• navigation — navigational, adj. /nav i gay sheuhn/, n. 1. the act or process of navigating. 2. the art or science of plotting, ascertaining, or directing the course of a ship, aircraft, or guided missile. [1520 30; < L navigation (s. of navigatio) a voyage.… …   Universalium