Sight Reduction Tables for Marine Navigation (Pub 229) VOL. 1 - Tapa blanda

Sinopsis

Sight Reduction Tables are used in celestial navigation to "reduce" (analyze) the "sights" (data obtained from a sextant at known times) in order to find your latitude and longitude. There are several styles of these tables, but they all do exactly the same thing: You tell the tables a location on earth and a location of a celestial body (the point on earth where the body would be directly overhead), and the tables tell you the angular height of that body above the horizon (viewed from the location you provided) and they tell you the true bearing to the body along the horizon. In the jargon of cel nav, you enter the tables with Assumed Latitude (a-Lat), declination (dec), and Local Hour Angle (LHA) and the tables tell you the calculated altitude (Hc) and azimuth (Zn) of the body. The various styles of tables differ only in how they are laid out and the final precision of the answers

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