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A general name for the angular height of a celestial body above the horizon that is determined from a sextant measurement or sight reduction. Angular height is often called "altitude" in other textbooks. When a body is right on the horizon, its height is 0°; when a body is overhead, its height is 90°. The term is used more precisely depending on the number of corrections that have been made to the sextant measurement. See Sextant Height, Apparent Height, Observed Height, and Calculated Height.