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NAO CONCISE SIGHT REDUCTION FORM - astro ukho gov

NAO CONCISE SIGHT REDUCTION FORM - astro ukho gov 2025

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The document outlines the NAO Concise Sight Reduction Form, providing a structured method for calculating altitude and azimuth based on celestial observations. It includes steps for recording latitude, longitude, declination, and applying correction factors to derive accurate navigational data using the Nautical Almanac.

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How to use a sight reduction table?

It is a calculated altitude because it is based on the assumed position. Enter the table with assumed latitude, declination and LHA. Find the correct page. Find the correct column for degrees of declination. Extract Hc, d and Z. Convert Z to Zn (azimuth) using these formulas supplied on each page:

What do you have to determine prior to using the sight reduction tables book?

So we use an Assumed Position something close to our Dead Reckoning Position, but rounded off in to whole numbers. We then take that Assumed Position and look up the Sight Reduction Tables (see below) to determine the bearing of the sun at that particular time.

What is the purpose of the sight reduction table?

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.

What is the process of sight reduction?

In astronavigation, sight reduction is the process of deriving from a sight (in celestial navigation usually obtained using a sextant) the information needed for establishing a line of position, generally by intercept method.

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