The New Navigation (Classic Reprint)
Language: English
Published by Forgotten Books, 2018
- Softcover
- New
Seller: Forgotten Books, London, United KingdomForgotten Books
AbeBooks seller since June 2, 2021
Condition: New
£ 13.27
Quantity: Over 20 available
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Print on Demand. This book is written for the seafaring community and is a treatise on astro-navigation techniques. The author, an experienced mariner, provides a detailed explanation of the 'New Navigation', a series of improvements to existing celestial navigation methods that were still relatively new in this period. The author begins with the basics and gradually builds up to complex scenarios like a double altitude sight followed by a run between sights, or obtaining a position by using the bearing and altitude of a celestial body and comparing it to known positions on land. The book was clearly well regarded by contemporary sailors and was likely very influential in disseminating these innovative navigation methods. It serves as a valuable historical record of how seafarers of that era navigated around the world. This book is a reproduction of an important historical work, digitally reconstructed using state-of-the-art technology to preserve the original format. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in the book.…
Seller Inventory # 9781332168736_0
- Title
- The New Navigation (Classic Reprint)
- Author
- F. C. Cross
- Publisher
- Forgotten Books
- Publication year
- 2018
- Condition
- New
- Book Type
- print-on-demand item
- Binding
- Paperback
- Language
- English
- ISBN 10
- 1332168736
- ISBN 13
- 9781332168736
- Seller catalogs
- Astronomy
The run between sights needs very little consideration, thus obviating carrying the first position on to the second, so making some of the same logarithms available for the second observation.
From personal experience I can recommend this problem on the score of accuracy, as the daily position by this method on the Mersey is always on the dot (as compared with the latitude obtained by meridian altitude, when the double altitude is frequently 2' or 3' out both in latitude and longitude owing to a late second sight.
Another advantage of this problem was pointed out to me by a navigator in the Navy (where this method is used almost exclusively), viz., that as the altitude is the last thing to be worked with, an hour angle may be assumed for the second observation and all the calculation finished before taking the altitude. In which case find the g.m.t. Corresponding to the hour angle used, and then the time-taker sings out stop to the observer, who takes the altitude at that precise second, from which is obtained the true zenith distance, which is compared with the one already calculated, and so the position is obtained within 2 or 3 minutes of the observation. Should the sun be clouded at that precise second, by altering the D. R. Longitude, the time may be made to give the same hour angle as at the time when the altitude was really taken.
In the Western Ocean, also from the Cape to Australia, this problem should be especially valuable, as the weather conditions, more often than not, preclude the observer from choosing his own times for sights, and the following examples will clearly show the extreme flexibility of this problem.
About the Publisher
Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at www.forgottenbooks.com
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
"Synopsis" may belong to another edition of this title.
Forgotten Books
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Forgotten Books’ Classic Reprint Series utilizes the latest technology to regenerate facsimiles of historically important writings. Careful attention has been made to accurately preserve the original format of each page whilst digitally enhancing the quality of the aged text.
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Forgotten Books publishes hundreds of thousands of rare and classic books.
This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works.
This text has been digitally restored from a historical edition. Some errors may persist, however we consider it worth publishing due to the work's historical value.
The digital edition of all books may be viewed before purchase if you request a sample.
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