SEXTANT Meaning and
Definition
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A sextant is a nautical instrument primarily used for celestial navigation, consisting of a graduated arch or frame with a pivoted arm carrying two small telescopes or sighting tubes arranged in parallel. It is employed to measure the angular distance between celestial bodies, typically the sun and the horizon or other celestial objects, to determine a ship or aircraft's position.
Constructed from brass or other durable materials, a sextant generally features a half-circle arc marked with degrees and minutes. The telescope on the left side of the sextant, also known as the index arm, allows the navigator to observe the celestial body, while the horizon glass on the right side enables them to sight the visible horizon or other reference objects. By measuring the angular distance between the celestial body and the horizon, the navigator can determine their latitude using navigational tables or formulas.
In addition to celestial navigation, a sextant can also be used to measure the angles between terrestrial objects for surveying purposes. This highly precise and versatile instrument has been indispensable for maritime navigation and was extensively utilized by sailors and explorers before the advent of modern satellite-based systems like GPS.
Today, the sextant continues to be a valuable tool for both professional and amateur navigators who partake in celestial navigation or as a backup method when satellite navigation systems are not available.
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In math., the sixth part of a circle; an instrument like a quadrant, but having an arc of only 60 degrees, or the sixth part of a circle, used at sea and by astronomers for measuring angular distances, taking altitudes, &c., by reflection.
Etymological and pronouncing dictionary of the English language. By Stormonth, James, Phelp, P. H. Published 1874.
Common Misspellings for SEXTANT
Etymology of SEXTANT
The word "sextant" originates from the Latin word "sextans", which means "one-sixth". It comes from the fact that the instrument is divided into six equal parts or sextants of a circle. The concept of dividing a circle into 360 degrees was common in ancient times, and the sextant was used to measure angles up to 60 degrees, which corresponds to one-sixth of a circle. Therefore, the name "sextant" reflects its six-part division and its measurement capabilities.
Similar spelling words for SEXTANT
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