Before GPS: Determining Your Position Using Celestial Measurements S.H.T.F. Edition: The How and Why of Celestial Navigation - Softcover

Timpe, Roy

Softcover

ISBN 13: 9798836869441

Verlag: Independently published, 2022

Inhaltsangabe

This is the S.H.T.F. Edition of ''Before GPS: Determining Your Position Using Celestial Measurements'' It includes additional sections with NOAA solar equations and tables generated from those equations to enable emergency navigation with out the Nautical Almanac. This emergency method will yield typical accuracy around 17 nautical miles, with only a sextant, accurate watch, these tables, pencil, and paper. As recently as 1995 the author came across a chart (still in use at the time) that differed from the WGS84 datum by about a half mile. The chart was based on a survey from the 19th century. Years ago, celestial measurements were the only way to determine your position at sea or a position far away from any well surveyed benchmark. How was the first benchmark even referenced? The answer is the stars. If a survey had to be made of a remote island or other region where referencing benchmarks was impractical, a surveyor had to consult the stars. In fact, the latitude and longitude from your GPS is based on astronomical measurements. While GPS has supplanted celestial methods in surveying and navigation, an appreciation for celestial sights and methods will help a person appreciate these older charts and surveys. An understanding of the celestial methods will also aid you in understanding how the GPS actually works.

Details zur Ausgabe

• Verlag: Independently published
• Erscheinungsdatum: 2022
• Sprache: Englisch
• ISBN 13: 9798836869441
• Einband: Taschenbuch
• Anzahl der Seiten: 72
• Kontakt zum Hersteller: Manufactured by Amazon on behalf of the author; https://www.amazon.de/hz/contact-us; ; c/o Amazon Media EU S.à.r.l., 38 Avenue John F. Kennedy; Luxembourg; L-1855; Luxemburg