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The theory of celestial navigation, with definitions of declination, subpoint, zenith and nadir, hour circle, Greenwich Hour Angle (GHA), Sidereal Hour Angle (SHA), and Local Hour Angle (LHA). Plans
[SailNet, 16 December 2000]
The chapters on celestial navigation calculations from the 1995 edition of The American Practical Navigator, originally published in 1802 and updated by NIMA. Chapters 18 - 23, with diagrams and examples, on time, almanacs, and sight reduction - its mathematics, calculations, and errors.
[I'd Rather Be Sailing, Dania, FL, USA]
The chapter on "the sailings" from the 1995 edition of The American Practical Navigator, originally published in 1802 and updated by NIMA. 17 pages, with diagrams and examples, on finding the course and distance from one point to another.
[I'd Rather Be Sailing, Dania, FL, USA]
The chapter on the sextant from the 1995 edition of The American Practical Navigator, originally published in 1802 and updated by NIMA. 10 pages with diagrams and examples.
[I'd Rather Be Sailing, Dania, FL, USA]
The chapter on navigational astronomy from the 1995 edition of The American Practical Navigator, originally published in 1802 and updated by NIMA. 50 pages with diagrams and examples regarding the celestial sphere and how it′s used. One of the classic texts.
[I'd Rather Be Sailing, Dania, FL, USA]
Tests and ranking of C. Plath, Tamay, Cassens & Plath, Astra, Freiberger and (plastic) Davis sextants. 4 pages including photos and tables of results and features
[Cruising World, June 2000]
[Vendor]
The simplest version of this sextant got me across the Atlantic, accurate landfall and all. Three models varying in features and cost. Top of the line has a full-horizon Beam Converger mirror and LED lighting.
[Davis Instruments Corp., Hayward, CA, USA]
Laminated cardboard build-it-yourself sextant from Germany. Good for training. Surprisingly accurate.
[Celestaire, Inc., Wichita, KS, USA]
Professional and yachting sextants and accessories, including telescopes, artificial horizons, prisms and lenses.
[Cassens & Plath GmbH, Bremerhaven, Germany]
Software to help with sight reduction includes star finder, chart browser, viewer, and position locator, leg calculator, and other tools. Excellent helper services on the site for celestial navigators include a Flash movie on how a sextant works, an interactive star finder for any time and place, a Nautical Almanac, and illustrated tutorial.
[Omar F. Reis, 05462-020 Sao Paulo, Brazil]The satisfaction of accomplishing a journey of steering by compass and fixing a position by the sun is one of the best I can think of.
Peter F. Prowant
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