sight reduction

[′sīt ri‚dək·shən]

(navigation)

The information needed for establishing a line of position, derived from the use of a sextant or an octant.

sight reduction

The process of deriving the information needed to plot a position line from an astronomical observation.

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References in periodicals archive ?

From the basics of coordinates, to sun sight reductions and lunar distance sights, to sextant adjustments and altitude corrections, and an exhaustive wealth of appendices, Celestial Navigation in the GPS Age is an absolute "must-have" for offshore navigators and a readily accessible self-teaching tool.

Celestial Navigation in the GPS Age

Hilaire Method of navigation; sun sight reductions; sights of other celestial bodies; special sights; lunar distance sights; the attitude observations; sextant checks and adjustments; operations at sea; insights from the navigation triangle; and concludes with exercises to reinforce understanding and build confidence.