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- Sextant abstract "A sextant is an instrument used to measure the angle between any two visible objects. Its primary use is to determine the angle between a celestial object and the horizon which is known as the object's altitude. Using this measurement is known as sighting the object, shooting the object, or taking a sight and it is an essential part of celestial navigation. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart. Common uses of the sextant include sighting the sun at solar noon and sighting Polaris at night (in the Northern Hemisphere), to find one's latitude. Sighting the height of a landmark can give a measure of distance off and, held horizontally, a sextant can measure angles between objects for a position on a chart. A sextant can also be used to measure the lunar distance between the moon and another celestial object (e.g., star, planet) in order to determine Greenwich time which is important because it can then be used to determine the longitude.The scale of a sextant has a length of 1⁄6 of a turn (60°); hence the sextant's name (sextāns, -antis is the Latin word for "one sixth"). An octant is a similar device with a shorter scale (1⁄8 turn, or 45°), where as a quintant (1⁄5 turn, or 72°) and a quadrant (1⁄4 turn, or 90°) have longer scales.Sir Isaac Newton (1643–1727) invented the principle of the doubly reflecting navigation instrument (a reflecting quadrant—see Octant (instrument)), but never published it. Two men independently developed the octant around 1730: John Hadley (1682–1744), an English mathematician, and Thomas Godfrey (1704–1749), a glazier in Philadelphia. John Bird made the first sextant in 1757, and they are still in existence on United States Naval Warships as of 2014. The octant and later the sextant, replaced the Davis quadrant as the main instrument for navigation.".
- Sextant thumbnail Sextant.jpg?width=300.
- Sextant wikiPageExternalLink history.
- Sextant wikiPageExternalLink Chapter_17.
- Sextant wikiPageExternalLink ScanSet_TIFF_demo.
- Sextant wikiPageExternalLink www.celnav.de.
- Sextant wikiPageExternalLink afpam11-216.pdf.
- Sextant wikiPageExternalLink lunars.
- Sextant wikiPageExternalLink www.hmnao.com.
- Sextant wikiPageExternalLink bowditch.
- Sextant wikiPageExternalLink CDSextantProject.htm.
- Sextant wikiPageID "29588".
- Sextant wikiPageRevisionID "606546731".
- Sextant hasPhotoCollection Sextant.
- Sextant subject Category:1731_introductions.
- Sextant subject Category:Astronomical_instruments.
- Sextant subject Category:Celestial_navigation.
- Sextant subject Category:Navigational_equipment.
- Sextant comment "A sextant is an instrument used to measure the angle between any two visible objects. Its primary use is to determine the angle between a celestial object and the horizon which is known as the object's altitude. Using this measurement is known as sighting the object, shooting the object, or taking a sight and it is an essential part of celestial navigation. The angle, and the time when it was measured, can be used to calculate a position line on a nautical or aeronautical chart.".
- Sextant label "Sekstant".
- Sextant label "Sestante".
- Sextant label "Sextant (navigatie)".
- Sextant label "Sextant".
- Sextant label "Sextant".
- Sextant label "Sextant".
- Sextant label "Sextante".
- Sextant label "Sextante".
- Sextant label "Секстант".
- Sextant label "سدس (آلة)".
- Sextant label "六分仪".
- Sextant label "六分儀".
- Sextant sameAs Sextant.
- Sextant sameAs Sextant.
- Sextant sameAs Εξάντας.
- Sextant sameAs Sextante.
- Sextant sameAs Sestante.
- Sextant sameAs Sextant.
- Sextant sameAs Sestante.
- Sextant sameAs 六分儀.
- Sextant sameAs 육분의.
- Sextant sameAs Sextant_(navigatie).
- Sextant sameAs Sekstant.
- Sextant sameAs Sextante.
- Sextant sameAs m.07b2x.
- Sextant sameAs Q179430.
- Sextant sameAs Q179430.
- Sextant wasDerivedFrom Sextant?oldid=606546731.
- Sextant depiction Sextant.jpg.
- Sextant isPrimaryTopicOf Sextant.
