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Index
Title Page Copyright Dedication Foreword Preface About the Author Acknowledgment Contents Frontispiece Foreword Preface 1. Introduction
The Heroic Era The Story Retold The Fundamental Idea
An Ancient Observation The Key Concept The Mariner's Angle
The Equal-Altitude Line of Position
The 3-D Picture The Limitations of Mechanical Methods The Only Solution
2. Plotting the Celestial Navigation Lop
Coordinates
Latitude and Longitude Greenwich Hour Angle and Declination
The Navigation Triangle
Sun and Earth The Local Hour Angle Azimuth Angle and Azimuth
Three Plotting Methods
The Concept Plotting Variables
3. The st. Hilaire Method
The Captain's Idea The Straight-Line Approximation The Error Why St. Hilaire? In Summary
4. The Nautical Almanac—An Overview
The Daily Pages The Altitude Corrections
5. Sun Sight Reductions
Using Inspection Tables
The Worksheet Altitude Corrections The GHA and Declination The LHA The Sketch Using H.O. 249 Tables Using H.O. 229 Tables
Using Direct Computation
Calculator Details
Four Examples of Sun Sights
6. Sights of other Celestial Bodies
Availability The Planets The Moon The Stars Star Sights by Tables or Calculator Star Sights by H.O. 249, Volume 1 Viewing Stars and Planets Identifying Stars and Planets
7. Special Sights
Polaris
Polaris by the Nautical Almanac Polaris by H.O. 249, Vol. 1 Polaris with Only a Sextant
Meridian Sights Latitude without Meridian Shots or UT Latitude and Longitude from Meridian Sights Longitude from Altitude and Latitude Time from a Lunar LOP and a Star Fix Position without St. Hilaire St. Hilaire without a Sextant
8. Lunar Distance Sights
The Concept Taking the Lunar Sight The Distance Clearing Concept Clearing the Lunar Distance The Sight Reduction A Lunar Example Accuracy So Why Lunars Today? Other Lunars
9. The Altitude Observations
The Sextant
The Horizon Mirror The Telescope Eye Relief Telescopes with Traditional Horizon Mirrors Field of View
Sextant Checks and Adjustments
The Telescope The Index Mirror The Horizon Mirror Index Error Backlash Sextant Arc Error
Sextant Observations
Observations at Home Taking a Sight Averaging Sights
Altitude Corrections
Dip Refraction Upper and Lower Limbs Parallax
10. Operations At Sea
Celestial before GPS Celestial with GPS Those Special Sights Plotting Running Fixes
The Traditional Running Fix The Estimated Position Running Fix The Short-Run Fix
Special LOP Orientations Great-Circle Sailing Time Accuracy Compass Deviation
Swinging the Ship Sun Azimuths
Ocean Pilot Charts
11. Tables, Calculators, and Computers: The Debate
Sight Reduction Tables Calculators and Computers
12. Insights from The Navigation Triangle
Equivalent Triangles The Azimuth Rules Understanding Inspection Tables Special Cases of the Azimuth Equation
13. Exercises for Understanding and Confidence
Sight Reduction and the Navigation Triangle Navigational Astronomy Courses, Distances, and Charts Lunar Distances Computer Programming
Appendices
A. Navigation Triangle Formulae B. Calculator Keystrokes C. Excerpts from the Nautical Almanac D. Sight Reduction Tables E. Sight Reduction Worksheets F. Concepts in Plane Trigonometry G. Sextant Arc Error Tables H. Dip Short of Horizon I. Sunrise/Sunset Azimuth Tables J. A Brief History of Navigation K. Annotated Bibliography
Abbreviations Used in the Text Index
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