Nautical Almanac for the Year 2017

Author: U.s. Nautical Almanac Office

Publisher: Government Printing Office

ISBN: 9780160932137

Category: Reference

Page: 358

View: 1686


For over 150 years the United States Nautical Almanac Office has published The Nautical Almanac, first as part of the American Ephemeris and Nautical Almanac, and then on its own, to provide the US Navy with a convenient form of the astronomical data used for celestial navigation. This book is still the standard resource for marine celestial navigation for the U.S. Navy. The Nautical Almanac provides essential astronomical information for every kind of sea-going vessel, from cruise liners to fishing boats. It is fully comprehensive, containing a set of concise sight reduction tables for the navigator, together with all the necessary information needed for use in determining the position at sea from sextant observations. Nautical Almanac is essential for astro-navigation and used by many astro-teaching courses.

The Science of Time 2016

Time in Astronomy & Society, Past, Present and Future

Author: Elisa Felicitas Arias,Ludwig Combrinck,Pavel Gabor,Catherine Hohenkerk,P. Kenneth Seidelmann

Publisher: Springer

ISBN: 3319599097

Category: Science

Page: 394

View: 4835


The uses of time in astronomy - from pointing telescopes, coordinating and processing observations, predicting ephemerides, cultures, religious practices, history, businesses, determining Earth orientation, analyzing time-series data and in many other ways - represent a broad sample of how time is used throughout human society and in space. Time and its reciprocal, frequency, is the most accurately measurable quantity and often an important path to the frontiers of science. But the future of timekeeping is changing with the development of optical frequency standards and the resulting challenges of distributing time at ever higher precision, with the possibility of timescales based on pulsars, and with the inclusion of higher-order relativistic effects. The definition of the second will likely be changed before the end of this decade, and its realization will increase in accuracy; the definition of the day is no longer obvious. The variability of the Earth's rotation presents challenges of understanding and prediction. In this symposium speakers took a closer look at time in astronomy, other sciences, cultures, and business as a defining element of modern civilization. The symposium aimed to set the stage for future timekeeping standards, infrastructure, and engineering best practices for astronomers and the broader society. At the same time the program was cognizant of the rich history from Harrison's chronometer to today's atomic clocks and pulsar observations. The theoreticians and engineers of time were brought together with the educators and historians of science, enriching the understanding of time among both experts and the public.

2019 Nautical Almanac

Author: Uk Hydrographic

Publisher: N.A

ISBN: 9781937196851

Category: Reference

Page: 336

View: 5034


The cornerstone for all celestial navigation, listing the celestial bodies used for navigation, a sight reduction table, and other information valuable to the offshore navigator. The content of this edition is identical to the United States Naval Observatory edition. Paradise Cay Publications is the only entity in the United States other than the US Government legally authorized to publish the full contents of the Nautical Almanac.

Celestial Navigation for Yachtsmen

13th edition

Author: Mary Blewitt

Publisher: Bloomsbury Publishing

ISBN: 1472942884

Category: Sports & Recreation

Page: 96

View: 6039


The 13th edition of this bestselling book is proof of the success of Mary Blewitt's concise and clear style in explaining a particularly difficult skill, and it has been the bible for many generations of ocean navigators. Since this book was first published, the huge advances in electronic navigation have transported most offshore navigators to a world of press-button convenience. However, there is still a vital need for traditional skills when things go wrong: batteries can fail, aerials go overboard, and electronics have been known to get wet. A bestseller for over 65 years, Celestial Navigation for Yachtsmen is a model of simplicity and clarity. The worked examples require only straightforward addition and subtraction, which explains why this book has truly earned its reputation for admirable conciseness and for making a tricky subject easy to understand. This edition has been thoroughly revised by Andy Du Port, the highly respected ex-editor of Reeds Almanacs. 'The "bible" of navigation for generations of yachtsmen... worth its weight in gold' Sailing