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Asextant is an instrument used to measure the anglebetween any two visible objects. Its primary use is to determinethe angle between a celestial object and the horizon which is knownas the object''s altitude. Making this measurement isknown as sighting the object, shooting theobject, or taking a sight and it is an essential part ofcelestial navigation. The angle, and the time when it was measured,can be used to calculate a position line on a nautical oraeronautical chart. Common uses of the sextant include sighting thesun at solar noon and sighting Polaris at night, to find one''slatitude (in northern latitudes). A sextant can also be heldhorizontally to measure the angle between any two landmarks whichallows for calculation of a position on a chart. A sextant can alsobe used to measure the Lunar distance between the moon and anothercelestial object (e.g., star, planet) in order to determineGreenwich time which is important because it can then be used todetermine the longitude.
