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Topic: Sextant


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In the News (Fri 24 May 19)

  
  Sextant - LoveToKnow 1911
Independently of Hadley and Newton the sextant was invented by Thomas Godfrey (1704-1749), a poor glazier in Philadelphia.
The sextant was formerly much used on land for determining latitudes in which case an artificial horizon (see below) is required, but it has now been largely superseded by the portable altazimuth cr theodolite, while at sea it continues to be indispensable.
The telescopes employed in sextants are of two kinds: the direct, for the more ordinary observations; and the inverting, for astronomical work, one of the eyepieces of which should be of high magnifying power, not less than 15 diameters.
www.1911encyclopedia.org /Sextant   (1782 words)

  
 sextant - HighBeam Encyclopedia
sextant instrument for measuring the altitude of the sun or another celestial body; such measurements can then be used to determine the observer's geographical position or for other navigational, surveying, or astronomical applications.
The sextant consists basically of a triangular frame, the bottom of which is a graduated arc of 60°; a telescope is attached horizontally to the plane of the frame.
A sextant may be used on land with an "artificial horizon" —a small, shallow receptacle containing mercury, which gives a truly horizontal surface.
www.encyclopedia.com /doc/1E1-sextant.html   (523 words)

  
 Pirate Event .com :: Arrr!ticles - Sextant (Measuring Instrument)   (Site not responding. Last check: 2007-10-12)
A sextant is a measuring instrument generally used to measure the angle of elevation of a celestial object above the horizon.
Held horizontally, the sextant can be used to measure the angle between any two objects, such as between two lighthouses, which will, similarly, allow for calculation of a line of position on a chart.
One uses a sextant by adjusting the arm and a worm adjustment until the upper or lower edge of an image of a celestial body (or the body itself if it's a star) touches the horizon.
www.pirateevent.com /piracy/sextant.html   (1918 words)

  
 Page Title
Sextants are made with a circular curve that is one sixth of a circle.
The other important parts of a sextant are a telescope, a piece of glass which is half see-through and half mirror (called the horizon glass), and a moving arm which has another mirror fixed to it.
In modern navigation sextants, the light ray from the celestial body is reflected in two mirrors (in series) one of which is adjustable and the other is half silvered.
canyongold.com /sextantbasics   (1507 words)

  
 Sextant Science Projects, Sextant, An instrument used for measuring angles primarily of celestial bodies like sun or a ...
The sextant is an instrument used for measuring angles primarily of celestial bodies like sun or a star.
The sextant was invented by a Englishman, John Hadley in 1731.
A telescope is mounted on the sextant, and a glass mirror is mounted in front of the telescope.
www.4to40.com /earth/science/index.asp?article=earth_science_sextant   (301 words)

  
 Sextant | World of Invention
The sextant is an instrument that measures angular distance of the sun and stars from the horizon to determine latitude.
The sextant consists of a telescope rigidly mounted to a bar and aligned with the horizon.
As it is adjusted, the sextant brings the objects together into a single image, and the observer reads the angle between them on a graduated scale.
www.bookrags.com /research/sextant-woi   (437 words)

  
 sextant - Search Results - MSN Encarta
We hold a sextant in our hands, our eyes look straight ahead, our minds are taut as a bow, and we order our work as the world orders creation, the...
For celestial navigation the navigator uses a sextant and a chronometer.
The sextant is a double-reflecting instrument that measures the angle...
uk.encarta.msn.com /sextant.html   (119 words)

  
 Sextant - Memory Alpha, the Star Trek Wiki
A sextant is an archaic navigational instrument used aboard naval ships and some aeronautic planes.
Benjamin Sisko used a sextant to navigate while aboard the Bajoran lightship he constructed in late 2371.
In the deleted scene from Star Trek Generations, Jean Luc Picard was given a sextant for Christmas from his family in the Nexus.
memory-alpha.org /en/index.php?title=Sextant&printable=yes   (176 words)

  
 NMAH | Navigation | Sextant
Sextants were traditionally made of brass, with scales graduated on silver.
Early examples of sextants from the 1750s were large, heavy, and costly, but the invention of the dividing engine in 1777 led to the production of smaller and less expensive instruments.
Sextants designed for aircraft navigation are equipped with a pendulum or a gyroscope that serves as an artificial horizon, as well as a mechanism that allows the navigator to average several observations taken in rapid succession.
americanhistory.si.edu /collections/navigation/type.cfm?typeid=6   (334 words)

  
 NOVA Online | Shackleton's Voyage of Endurance | How a Sextant Works | PBS
All it is is a device that measures the angle between two objects.
With this sextant, one of the mirrors (mirror A in the diagram) is half-silvered, which allows some light to pass through.
What makes a sextant so useful in navigation is its accuracy.
www.pbs.org /wgbh/nova/shackleton/navigate/escapeworks.html   (168 words)

  
 Wye Beagles theft - Sextant returns home
Sextant had been castrated and his ear tattoos removed - click here to find out what happened in court.
Though Sextant was mutilated and castrated, seven of his offspring survived because, at the time of the raid, they were not at the kennels but in the care of walkers.
Although Sextant can no longer be used for breeding, his puppies will carry the bloodlines on for future generations of hunting beagles.
www.beaglesinperil.org.uk /sextant.htm   (287 words)

  
 Sextant Capital Management   (Site not responding. Last check: 2007-10-12)
Sextant may use this information to determine what type of information is most useful, improve this web site, address your specific needs, provide better customer service and for general marketing purposes.
Sextant employees are instructed to use strict standards of care in handling the personal, confidential information and the handling of such information is dealt with in the Sextant Privacy Code.
Sextant is required by law to use your social insurance number when submitting tax reports to the Canada Customs and Revenue Agency and may provide it to third parties engaged to prepare income tax reports for Sextant.
www.sextantcapital.com /privacy.php   (1414 words)

  
 Ashera Sextant   (Site not responding. Last check: 2007-10-12)
Sextant drops Ashera's tendency to create shorter tracks in favor of five sprawling ambient pieces, the shortest of which is over ten and a half minutes long.
There is an appropriately nautical flavor to each of the track titles and we begin with the quiet "A Very Large Sail." This is a striking, synth-drone track that transmits a feeling of vast spaces--they may be endless, open seas (as hinted at by the title), or the arguable infinity of deep space.
With its lush photographs of sailing ships and ocean craft, Sextant is an album that manages to reference ocean journeys without dwelling too much on limiting nautical sonics.
www.ashera.com /SEXTANT.htm   (916 words)

  
 Sextant   (Site not responding. Last check: 2007-10-12)
The sextant basically consists of a telescope, a half silvered horizontal mirror which the telescope "looks" through and a moving arm on which the index mirror is fixed.
The sextant relies on the optical principle that if a ray of light is reflected from two mirrors in succession then the angle between the first and last direction of the ray is twice the angle between the mirrors.
To use the sextant the telescope must be focused on the horizon.
www.dynagen.co.za /eugene/where/sextant.html   (801 words)

  
 How to use a Sextant
The sextant basically consists of a telescope, a half silvered horizontal mirror which the telescope "looks" through and a moving arm on which the index mirror is fixed.
The sextant relies on the optical principle that if a ray of light is reflected from two mirrors in succession then the angle between the first and last direction of the ray is twice the angle between the mirrors.
To use the sextant the telescope must be focused on the horizon.
www.nauticality.uk.com /nlhowusesextant.html   (855 words)

  
 Sextant Framework   (Site not responding. Last check: 2007-10-12)
Sextant is a comprehensive framework for node and event localization in wireless networks.
Sextant extracts geographic information from cheap, already-present wireless links and can use this information to infer node and event location with high accuracy.
Sextant operates by setting up a system of relative geographic constraints among the network participants based on network connectivity and solving this system in a distributed and efficient manner with the aid of absolute position information provided by a small number of landmarks.
www.cs.cornell.edu /people/egs/Sextant/overview.php   (452 words)

  
 BoatUS BoatTECH Guides: Sextants
Sextants have been the primary device for offshore navigation for centuries, initially developed to guide mariners on trade route passages.
While they are used to measure angles between a celestial body and the horizon, they can also be used to measure the apparent height of a known landmark for determining range, or to measure the angle between two landmarks to establish a line of position.
A sextant's accuracy is expressed in "seconds of arc".
www.boatus.com /boattech/sextant.htm   (276 words)

  
 Making a Micrometer Vernier Sextant: Section 1
Think of a sextant with a normal vernier to read the minutes of arc at the bottom of the index arm.
The sextant is all brass (as designed) except for one or two small pieces.
The total combined error caused by the index mirror error and the horizon mirror error equates to an error of 0.0001mm in the positioning of the parallel rays from the sun at a 60 degree apparent solar altitude (increasing to 0.00014mm at 90 degrees, reducing to 0.000058mm at 0 degrees).
www.geocities.com /richardandtracy/sextant01.htm   (1065 words)

  
 Eight-inch Brass Sextant. Stanley, London.
The sextant measures 10 1/2 inches (26.7 cm) tall, 10 3/8 inches (26.4 cm) wide, 4 3/4 inches (12.1 cm) deep, and weighs 5 pounds (2.27 kg).
The sextant is beautifully made of solid brass with a German silver scale, and is fully functional.
The angle on the vernier scale is set to zero degrees and the index mirror is adjusted so that the images from both optical paths as viewed through the telescope align to produce one image.
www.shooterdog.com /sextant/sext-sm8.htm   (340 words)

  
 [No title]
The first real ancestor of the modern-day sextant as a multipurpose nautical instrument was the cross staff or Jacob's staff.
In the illustration above, a simple sextant (as described in the text) is being used to determine the angle of inclination of the top of a flagpole.
To determine the angle of inclination, the student must determine the difference between the sextant reading for the top of the flagpole, 70°, and the reading for the horizon, 90°.
www.lycos.com /info/sextant.html   (605 words)

  
 Brass Sextants Manufacturer,Navigation Sextants,Marine Sextant,Marine Navigation Sextants,Brass Sextant Exporter,India   (Site not responding. Last check: 2007-10-12)
Sextant is a name derived from Latin word sex that means six.
Sextant as a product is named so because of the celebrated arc of 60 degrees (i.e.
In earlier times, marine sextant had a fixed telescope leveled on the horizon and a radial arm is moved against an arc scaled in degrees.
www.nautical-instrument.com /sextants.html   (390 words)

  
 The History of the Sextant
It was a simple matter to enlarge Hadley's octant, an eighth of a circle, to the sextant, a sixth of a circle, that could measure up to 120 degrees.
Here’s a fine brass sextant from the early nineteenth century by the master London instrument maker John Dollond.
The challenge was to produce sextant frames that were light weight, low wind resistance and with a minimum change is dimensions with changes in temperature.
www.mat.uc.pt /~helios/Mestre/Novemb00/H61iflan.htm   (2901 words)

  
 The Antique Sextant - Full Sextant Product Line
Most sextants are stamped "Stanley London," after W. Stanley of Stanley and Co. in London, who made precision instruments one hundred years ago.
We offer a variety of sextant models in different sizes, and many are highly polished to a beautiful finish.
All sextants are quality made and are fully functional, however, they are not intended for navigation.
www.antiquesextant.com /antique_sextants.htm   (183 words)

  
 R.M.S. Titanic, White Star Line Reproduction Brass Sextant from The Brass Compass
It is a full-sized solid brass sextant with adjustable mirrors and four swing-arm filters in heavy mounts.
A convenient brass knurled screw on the top of the sextant serves to adjust the index mirror, and the horizon mirror has a thumbscrew adjustment on the back of the sextant.
The sextant is accompanied by a beautiful velvet lined hardwood storage and display box that has fitted cut-outs to securely hold the sextant.
www.brasscompass.com /titanic1.htm   (538 words)

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