Navigation and Nautical Astronomy (Classic Reprint)by Frank Cole Stebbing
The earlier portion of this book deals with that division of the subject which does not require a knowledge of astronomical definitions, nor, with the exception of Great Circle Sailing, of Spherical Trigonometry; the investigation of Raper's Rules for finding the distance from a Mountain Peak being inserted in the
Excerpt from Navigation and Nautical Astronomy
The earlier portion of this book deals with that division of the subject which does not require a knowledge of astronomical definitions, nor, with the exception of Great Circle Sailing, of Spherical Trigonometry; the investigation of Raper's Rules for finding the distance from a Mountain Peak being inserted in the chapter on "Fixing a ship's position on a chart."
The second portion - the various necessary definitions having been stated and an explanation given of the method of constructing Nautical Astronomy diagrams - consists of the discussion of Time, Greenwich Date, Sextant, Altitudes and the rules for their correction; Longitude, Latitude, Chronometer and Compass Errors; Day's Work and Sumner's Method. This concludes the really practical portion, and then follows a chapter containing the investigation of the various corrections, Dip, Parallax, etc.; and of the errors produced in Longitude, Latitude, etc., by small errors in time or observation. These errors are treated geometrically, and are thus shortly and simply explained without the use of Differential Calculus (not admissible in an elementary work) or the long analytical methods which usually take its place.
The last chapter contains the investigation of Latitude by observation of the Pole Star; Equation of Equal Altitudes (the first method a short and simple one, much preferable to the ordinary method, which is, however, inserted as being familiar to many); Time at which the Sun will dip in a ship steaming at a high rate of speed; Interpolations; and a few other problems of interest in Nautical Astronomy.
A number of Miscellaneous Examples is added, which it is hoped will provide, in many cases, exercises for the student's ingenuity.
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