Book : How To Use Plastic Sextants With Applications To...

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Sextants are used to measure angular heights of celestial bodies above the horizon to find the latitude and longitude of the observer. They can also be used on land with artificial horizons. Sextants can also be used to find the correct Universal Time by measuring the angular distance between the moon and another body along its path across the zodiac.In coastal waters or on land, sextants can be used for very accurate piloting by measuring the horizontal angles between charted landmarks. The vertical angle of a peak above its baseline determines the distance to it, which, combined with a compass bearing, yields a position fix from just one landmark. The angular dip of an object (island or vessel) below the visible horizon can also be used to determine the distance to it.This booklet explains how to get the best results from plastic sextants, and presents numerical comparisons with similar data from metal sextants. Sextant piloting techniques are also reviewed as they are an ideal use of a plastic sextant. Review A unique book with lots of very useful information and instructions, much of which translates very well to metal sextants also. Highly recommend it. Excellent information on index correction, as well as a terrific review on Sextant piloting. - Scott, NavListA fine book with lots of information for both beginning and experienced navigators and navigation enthusiasts. BUY IT. Practically anything you can do with a sextant is covered in this book. Its really good. The section on sextant piloting is more detailed than any other treatment that I have seen. - FER, NavList From the Inside Flap The sextant sight taking procedures discussed in this book are the ones to follow to achieve the best sights with all sextants, metal and plastic-it is just more crucial that navigators follow these procedures when using plastic sextants if they want to achieve practicable accuracies. From the Back Cover Related books by David Burch:Celestial Navigation - A complete home study course,andThe Star Finder Book - A guide to the many uses of the 2102-D Star Finder About the Author David Burch, PhD, FRIN, is the Director of Starpath School of Navigation, which after 26,000 classroom students since 1979 switched to all online training in 2008. He is the author of 13 books and hundreds of magazine articles. He received the Institute of Navigations Superior Achievement Award for outstanding performance as a practicing navigator. He is Fellow of the US Institute of Navigation as well as a Fellow of the Royal Institute of Navigation in London. He has extensive ocean sailing experience covering much of the globe, and once held an elapsed time record for the Victoria to Maui Yacht Race that lasted for 16 years. On the academic side, he is a past Fulbright Scholar with a PHD in physics.
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