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Define sextant altitude

A sextant is a marine navigation instrument which is used to measure Vertical Sextant Angle (VSA); Horizontal Sextant Angle (HSA); Altitudes. Altitude as indicated by a sextant or similar instrument before corrections are applied. The altitude of a celestial body as measured by a sextant. Explanation of​.

Define sextant altitude

Sextant definition, an astronomical instrument used to determine latitude and longitude at sea by measuring angular distances, especially the altitudes of sun,​. Corrections to a Sextant Altitude. Index Error. This error can be found using the horizon. The sextant's altitude is set to zero and then the two images of the.