sight-reduction tables

sight-reduction tables

[′sīt ri¦dək·shən ‚tā·bəlz]
(navigation)
Tables for performing sight reduction obtained by the use of a sextant or octant, particularly those sights for determining computed altitude for comparison with the observed altitude of a celestial body to determine the altitude difference for establishing a line of position.
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Written by experienced navigator Leonard Gray, 100 Problems in Celestial Navigation: Self Contained--With Answers is a compendium of realistic navigation problems, including excerpts of all required Nautical Almanac pages and sight-reduction tables, complete with answers and explanations.