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Index:

THE THEORY
Heavenly Bodies.
The Geographical Position.
Declination.
Hour Angle.
The Zenith.
The Horizon.
Altitude.
Zenith Distance.
The Elevated Pole.
Azimuth and Azimuth Angle.
Great Circles.
Universal Time.
The Position Line.
The Meridian Passage.
Spherical Triangles.
The Intercept.
Sextant Altitude and True Altitude:
Dip.
Refraction.
Semi-Diameter.
Parallax.
THE PRACTICE
Almanacs and Tables.
A Sun Sight in Winter
- Using the Sextant.
- Recording the Sights.
- Correcting the Data: Watch Time to UT; Sextant Altitude to True Altitude.
- Using the Almanac: LHA Sun from UT.
Using the Tables: Assuming a Position; Declination; Tabulated Altitude and Azimuth.
Plotting the Sight.
A Sun Sight in Summer.
A Moon Sight.
Planet Sights.
Meridian Sights.
Star Sights
- Sidereal Hour Angle.
- Declinations.
- Twilight and Preparation.
- Selected Stars.
- Precession and Nutation.
- Using the Meridian Passage.
Pole Star Sights.
Selecting the Best Position.
NOTES
Sextants
- Sextant Error: Index Error; Side Error.
Spherical Triangles.
Calculators.
Concise Sight Reduction Tables.
Practice Sights.
Plotting Sheets.
APPENDICES
A. Nautical Almanac for 27-29 July 1997.
B. Nautical Almanac for 6-8 December 1997.
C. Increments and Corrections.
D. Altitude Correction Tables 10º-90º for Sun, Stars, Planets.
E. Altitude Correction Tables0º-35º for the Moon. Altitude Correction Tables 35º-90º for the Moon.
F. AP3270 Vol 3: LHA, Dec, Hc, d, Z.
G. AP3270 Vol 1: Selected Stars.
H. AP3270 Correction Tables 5.
INDEX



Contents:

The 12th edition of this bestselling textbook is proof of the success of Mary Blewitt´s concise and clear style in explaining a particularly difficult skill, and it has been the bible for many generations of ocean navigators.
Since this book was first published, the huge advances in electronic navigation have transported most offshore navigators to a world of press-button convenience. However, there is still a vital need for traditional skills when things go wrong: batteries can fail, aerials go overboard, and electronics have been known to get wet.
A bestseller for over 50 years, Celestial Navigation for Yachtsmen is a model of simplicity and clarity. The worked examples require only straightforward addition and subtraction, which explains why this book has truly earned its reputation for admirable conciseness and making a tricky subject easy to understand.