Ebbco Sextant in case with instructions

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Ebbco Sextant with case & instructions plastic with 7" radius good condition 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 altitude. Making 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 . Any questions let me know...