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Index
Cover
Contents
Title
Copyright
Introduction
Chapter 1: The Earth and the Heavens
The Terrestrial Sphere
The Celestial Sphere
Horizon
Chapter 2: The Sextant
How the Sextant Works
Setting Up the Sextant
True Altitude and Sextant Altitude
USing a Sextant
Care of the Sextant
Chapter 3: The Noon Sight for Latitude
Finding the Time of Local Noon
Taking the Sight
The Theory
Calculating a Latitude
Other Bodies
'Maximum' Altitudes
Chapter 4: Time
"The ‘Mean Sun’ and the ‘Apparent Sun’
Zone Time
Naming the Zones: ‘+’ or ‘−’
Standard Time
The Navigation Clock
Chapter 5: Position Lines and Plotting
Azimuth
Practical Plotting
Chapter 6: Sun Sights
The Assumed Position
Azimuth and Intercept
Producing a Sun Sight
Using the Sight
Chapter 7: The Planets
Twilight
Planet Identification
Shooting a Planet or Star
Planet Sight Reduction
Chapter 8: The Moon
Corrections in Sight Reduction
The Moon Sight Pro Forma
Altitude Correction Tables for the Moon
Chapter 9: The Stars
Brightness of stars (magnitude)
First Point of Aries and Sidereal Hour Angle (SHA)
Reducing a Single Star Sight
Planning a Star Sight Session
Distance Run Between Star Sights
Multiple Star Sight Reduction
Precession and Nutation
Chapter 10: Polaris – the Pole Star
Corrections to the Apparent Altitude of Polaris
Chapter 11: Compass Checking on the Ocean
Sunset and Sunrise: Amplitude Tables
Points to note
Azimuths for Compass Checks
Chapter 12: The Shortest Way
Great Circle Sailing
Composite Tracks
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