Beschrijving

Rapid Sight Reduction Table: v. 1 is a practical reference manual used in celestial navigation, especially by mariners, sailors, and navigators who need to determine their position at sea using a sextant. It is part of a standard series published by the United Kingdom Hydrographic Office, designed to support traditional navigation techniques before the widespread use of GPS.

The core of the book consists of pre-computed sight reduction tables for celestial bodies — the sun, moon, planets, and selected stars — that allow users to convert sextant observations into useful navigational information quickly. By using the tables, navigators can find values such as the altitude and azimuth of celestial bodies with minimal calculation, which helps determine their latitude and longitude while offshore.

Designed for ease of use at sea, the tables are typically organized by date, time, and assumed positions, and include supporting illustrations and instructions. While modern electronic systems have largely supplanted manual methods, this publication remains valuable for traditional navigators, students of navigation, and anyone interested in mastering celestial navigation techniques.