81220

WHAT IS MEANT BY SIDES AND ANGLES OF A SPHERICAL

TRIANGLE

RIGHT-ANGLED TRIANGLES, NAPIER'S RULES OF CIRCULAR

20-21

TO FIND MEAN TIME AT SHIP FROM THE HOUR ANGLE OF

A STAR.

52-55

ACCELERATION OF RIGHT ASCENSION OF MEAN SUN FOR THE
TIME ELAPSED SINCE NOON AT GREENWICH

LATITUDE BY A MERIDIAN ALTITUDE ABOVE THE POLE

LATITUDE BY MERIDIAN ALTITUDES ABOVE AND BELOW POLE

EX-MERIDIAN OF THE POLE STAR

55-56

57

60-61

62-65

THE MOON: TO CORRECT THE R. A. AND DEC.

70-71

72-74

75-76

77-79

.

79-80

CHAPTER XX

LATITUDE BY DOUBLE ALTITUDES

PAGES

NATURE OF THE PROBLEM EXPLAINED AND SKELETON FORM 104 107

RESPECT TO MERIDIAN AND

DIFFERENT POSITIONS WITH

ZENITH WHICH MAY OCCUR

CORRECTION FOR RUN OF THE SHIP

SIMULTANEOUS ALTITUDE OF TWO STARS

EXAMPLE OF DOUBLE ALTITUDE OF SUN

EXAMPLE OF SIMULTANEOUS ALTITUDE OF TWO STARS

THE VERIFICATION OF DOUBLE ALTITUDES BY SUMNER LINES

CHAPTER XXI

LUNAR

PRINCIPLE OF THE METHOD

HOW THE PROBLEM IS WORKED

SKELETON FORM

EXAMPLES

CLEARING THE DISTANCE EXPLAINED

CHAPTER XXII

THE EQUATION OF EQUAL ALTITUDES

METHOD OF FINDING ERROR OF CHRONOMETER BY THE AID

OF AN ARTIFICIAL HORIZON

108 109

109-110

111 112

113 115

TO FIND THE TIMES AT WHICH A BODY IS ON THE PRIME

VERTICAL; AT WHICH IT RISES AND SETS; ITS ALTITUDE

AT ANY TIME.

156 159

VOL. II.

a

To CALCULATE THE TRUE LUNAR DISTANCE AT ANY GIVEN

GREENWICH DATE

PAGES

160

TO CALCULATE THE AZIMUTH FROM THE LATITUDE, DECLINA-

TION, AND HOUR ANGLE

TO FIND THE LATITUDE FROM THE ALTITUDE, DECLINATION,

AND HOUR ANGLE

LONGITUDE BY AN ALTITUDE NEAR THE MERIDIAN.

LATITUDE BY CHANGE OF ALTITUDE

CHAPTER XXIV

ADDITIONAL CHART PROBLEMS

TWO USEFUL PROBLEMS IN COASTING

161-163

163-165

165-166

166

167-172

CHAPTER XXV

GREAT CIRCLE SAILING

EXPLANATION OF THE PROBLEM

EXAMPLE OF THE GREAT CIRCLE COURSE BETWEEN

173-176

THE

FASTNET AND SANDY HOOK; DISTANCE; FIRST COURSE;

VERTEX.

176-182

USE OF A TERRESTRIAL GLOBE; GRAPHIC METHODS; TABLES 193 194

CHAPTER XXVI

MAGNETISM AND THE CAUSES OF AND COM-

PENSATION FOR DEVIATION

How To MAGNETISE A STEEL BAR

195 197

DIP.

197-199

SUB-PERMANENT MAGNETISM OF A SHIP DETERMINED BY ITS