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• Octant (instrument)
  The Octant, also called reflecting quadrant, is a measuring instrument used … The sextant was used with great care and only for lunars , …
  21 KB (3304 words) - 00:44, 30 October 2008
• Sextant
  A sextant is an instrument generally used to measure the altitude of a celestial … An octant is a similar device with a shorter scale (1 …
  17 KB (2370 words) - 08:11, 17 December 2008
• Sextant (disambiguation)
  Sextant may refer to: Sextant , a navigation instrument … Octant , a navigation instrument, precursor to the navigator's sextant. Sextant …
  672 B (73 words) - 17:39, 1 June 2008
• John Hadley
  February 14 , 1744 , East Barnet , Hertfordshire ) English mathematician inventor of the octant , the precursor to the sextant , around 1730. …
  3 KB (354 words) - 21:46, 19 December 2008
• Reflecting instrument (section The octant)
  The octant … The origin of the sextant is straightforward and not in dispute. Admiral John Campbell , having used Hadley's octant in sea …
  21 KB (3263 words) - 17:59, 1 October 2008
• Celestial navigation
  measurements led to the development of a number of increasingly accurate instruments, including the kamal , astrolabe , octant and sextant . …
  19 KB (2922 words) - 22:42, 17 November 2008
• George Hadley
  unremarkable childhood, and was eclipsed in his early years by his older brother John , the inventor of the octant (a precursor to the sextant ). …
  4 KB (560 words) - 23:53, 22 November 2008
• Navigational instrument
  It was replaced by the back staff and later by the octant and sextant . Quadrant A very simple instrument which used a plumb bob. …
  5 KB (656 words) - 00:58, 2 September 2008
• Measuring instrument
  Angle : Goniometer Cross staff Quadrant Reflecting instrument s … Octant Sextant Reflecting circles Repeating circles Protractor Theodolite …
  37 KB (4331 words) - 09:23, 6 January 2009
• Mariner's astrolabe
  Octant (instrument) See also : Astrolabe Davis quadrant Cross staff … Sextant References : External links : http://www. astrolabes. org/mariner. …
  6 KB (944 words) - 20:08, 18 September 2008
• 1731 in science
  The octant is developed by John Hadley ; the sextant eventually replaced the octant and became an essential tool of navigation. …
  1 KB (139 words) - 06:00, 16 August 2008
• Commercial Revolution
  and the invention of the octant after 1730 By the late 18th century, navigators replaced their prior instruments with octants and sextants. …
  32 KB (4707 words) - 16:56, 5 January 2009
• Elton's quadrant
  The octant was an easier instrument to use and Hadley had supported … In the end, the Hadley octant and later sextant took precedence as …
  7 KB (1082 words) - 10:16, 4 June 2008
• Jacob's staff
  by the backstaff or quadrant , neither of which required the user to stare directly into the sun, and later by the octant and the sextant . …
  13 KB (1908 words) - 20:22, 3 December 2008
• History of navigation
  The sextant was derived from the octant in 1757 in order to provide for the lunar distance method . With the lunar distance method, …
  28 KB (3711 words) - 06:43, 3 January 2009
• Theodolite
  The transit replaced the railroad compass , sextant and octant and was distinguished by having a telescope shorter than the base arms, …
  17 KB (2314 words) - 18:25, 29 December 2008
• Galley
  The compass did not come into use for navigation until the 13th century AD, and sextant s, octant s, accurate marine chronometer s, and …
  31 KB (4789 words) - 08:56, 14 December 2008
• Scientific Revolution
  of modern economics and social science John Hadley (1682–1744) was mathematician inventor of the octant , the precursor to the sextant . …
  47 KB (6590 words) - 23:05, 5 January 2009
• Conversion of units
  octant |   | ≡ 45° | ≈ 0.785 398 rad | Angle: sextant |   | ≡ 60° | ≈ 1.047 198 rad | quadrant |   | ≡ 90° | ≈ 1.570 796 rad | …
  56 KB (6425 words) - 03:05, 6 January 2009
• John Campbell (Royal Navy officer)
  instrument with the common wooden Hadley octant as means of observing … a sextant of 20 inches radius with a brass frame and 1/3 the weight …
  11 KB (1442 words) - 22:38, 31 October 2008

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