by E.W. Sturdy, Lieutenant, U.S. Navy
Not for the navigationally faint-at-heart! Not a text book, but rather a reference handbook for that most reliable of all navigational methods--celestial! Reliable? Certainly! The sun may not shine, (nor the moon for that matter), for a couple of days, but when the GPS system fails, (AS IT HAS AND AS IT WILL AGAIN!), you will need something you can rely on to replace it. That's why we make these older navigational texts available. This one contains chapters in sections on Latitude; Meridian Altitude of the Sun, the Moon and the Planets, Meridian Altitudes, Circum-Meridian Altitudes, Single Altitudes, Changes of Altitudes, Polaris, and Two Altitudes of all. For Longitude, Time Sights, Litrow's Method, Equal Altitudes, and Changing Date in Crossing 180th Meridian. For, Explanation, Lines of Position by Moon and Star Observations, Line of Position to Obtain Distances, Bearings and Positions, Making Light by Aid of Position, Running for a Light or Low Island, Line of Position and Approximate Latitude, Showing Manner in which Lines of Position vary with Bearing of the Sun, Showing Effect of Errors in Altitude, Showing Probability that a Time Sight cannot be worked with a Meridian Altitude, How to Plot a Noon Position quickly, Bow and Beam Bearing and Lines of Position from Coast Survey Work. Under Compass Error, there are chapters on Explanation, Amplitude, Altitude Azimuth, Time Azimuth and By Lines of Position. First published 1884.
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