Celestial Navigation by H.O. 249 | LIBROS NÁUTICOS | Navegación Costera y Astronómica | Librería Náutica cartamar. Libros Náuticos. Cartas Náuticas | Libreria nautica Cartamar. Libros nauticos. Cartas nauticas.

Contenido:

"Any kind of boating can be fun", the author points out, "racing around the marks, or coastwise cruising where there is almost always at hand visual reference ashore from wich bearings can be taken for locating one's position and thus finding one's way home. Severing these ties with land, however, offers a new kind of fun, a new kind of freedom, a freedom from dependence on land".

Here is a basic beginner's book, introducing the tyro to the tools, he vocabulary, and the techniques of celestial navigation. Among the recomended tools are the H.O. 249 Tables, the most widely used among amateur navigators at sea, because of their simplicity.

The ability to determine one's position at sea both liberates the sailor from the land and enables him to find his way to his destination.

If you can read, add and subtract, understand angles, and use a protractor, you can learn to navigate in your armchair or at sea from Celestial Navigation by H.O. 249.

A former member of the Hawaii Territorial Legislature, John E. Milligan went to the islands for the summer of 1934-and stayed. He was an executive in personnel and labor relations for forty years and an avid, experiences sailor.



Índice:

INTRODUCTORY NOTE

CELESTIAL NAVIGATION FOR THE BEGINNER

I. WHAT YOU WILL NEED
Time by Radio
Types of Sextants
Nautical Almanac
H.O. 249 Tables
Other Materials

II. LANGUAGE
Latitude and Longitude
How Latitude is Plotted
How Longitude is Plotted
Declination (Dec.)
Greenwich Hour Angle (LHA)
Local Hour Angle (LHA)
Greenwich Mean Time
Sidereal Hour Angle (SHA)
Altitude (Alt.)
Zenith
Zenith Distance (ZD)
Azimuth (Zn)

III. TAKING A SIGHT
The Sextant
Altitude Corrections
Instrument Correction (IC)
Height of Eye (Dip)
Correction (Refraction, etc.)
Additional Corrections

IV. DETERMINING LATITUDE
Latitude Formula
Time of Noon
"d" Factor
Standard Times
Taking the Sight

V. LINE OF POSITION (LP)-FIX
Step by Step to Line of Position
Work Sheet

VI. PLOTTIENG A LINE OF POSITION (LP)
Plot Sheet
The Problem Plot

VII. FIX
Plot Sheet
Work Sheet
Plot Sheet
Almanac Page

VIII. OTHER MEMBERS OF THE SOLAR SYSTEM
Venus Work Sheet
Venus Plot

IX. MOON
Work Sheet
Correction Tables
Plot

X. STARS
Polaris
Polaris Tables

XI. THE THREE STAR FIX
Star Work Sheet
Three Star Plot
Star Plot Using H.O. 249, Vol II

XII. A START IN STAR FINDING

XIII. POLISHING YOUR SKILL
The Navigational Triangle
Computing Hc and Zn by Trigonometry
Other information in Almanac
Refining the Noon Sight
The Direct Plot
H.O. 214
H.O. 229

APPENDIX
Table of Formulas
Abbreviations
Symbols