The whys and wherefores of navigation

by Gershom Bradford

INDEX

• A
• Acceleration for longitude, [91]
• Amplitude, [12], [97]
• Aphelion, [8]
• Apogee, [139]
• Astronomical triangle, [102]
• Azimuth, [12], [96]
• altitude, [98]
• Weir’s diagram of, [98]
• Azimuths and amplitudes, [93]
• C
• Calendar, [64]
• Celestial latitude, [14]
• longitude, [14]
• Chart, contours, [155]
• corrections, [151]
• scales, [152]
• Charts, [146]
• datum, [155]
• diagrams of symbols, [156]
• fathom curves, [158]
• information on, [154]
• symbols, [152]
• Chronometer time, necessity of accuracy in, [87]
• Circles of equal altitudes, [110]
• Circum-meridian altitude, [82]
• Compass, [93]
• deviation of, [94]
• error of, [94]
• naming of, [99]
• Coordinates, [9]
• Corrections for observed altitudes, [68]
• D
• Day lost and day gained, [37]
• Dead reckoning, [1]
• Declination, [15]
• daily change of, [24]
• Deviation, naming of, [100]
• Dip, [72]
• Double altitude problem, [120]
• E
• Earth’s orbit, [8]
• revolution around the sun, [20]
• Eclipses, [141]
• Ecliptic, [14]
• Equal altitude circle, [109]
• Equal altitude method, [104]
• Equation of Time, [56]
• diagram of, [62]
• error due to obliquity, [60]
• Equinoctial colure, [26]
• Ex-meridian altitude, [82]
• bodies below the pole, [86]
• planets, [86]
• stars, [86]
• F
• First point of Aries, [14], [26]
• G
• Gnomonic chart, [150]
• Great circles, [10], [17]
• Great-circle sailing, [150]
• Greenwich mean time on navigator’s watch, [54]
• H
• Horizon, rational, [11], [75]
• sensible, [12], [73]
• visible, [11], [73]
• Hour circles, [13]
• I
• Index correction, [68]
• J
• Johnson’s method, [123]
• diagrams, [126]
• K
• Kepler’s Law, [56]
• L
• Latitude, [78]
• by Polaris, [88]
• factor, [129]
• formula for finding, [80]
• Laying a course, [96]
• Lights, characteristics, etc., [153]
• Longitude, [101]
• and time, [102]
• by equal altitudes, [104]
• factor, [125]
• prime vertical, [103]
• stars and planets, [105]
• Lunar cycle, [143]
• M
• Mean time into sidereal, [106]
• Mercator Projection, [146]
• diagram, [147]
• Meridian altitude, [78]
• time to observe a star, [81]
• to report at noon, [81]
• Meridional parts, [149]
• Middle latitude sailing, [4]
• Mizar, [89]
• Moon, [139]
• full, [140]
• harvest, [143]
• new, [140]
• Moon’s declination, [143]
• diagram, [144]
• nodes, [143]
• retardation, [142]
• revolution, [140]
• right ascension, [142]
• N
• Nadir, [11]
• Napier’s diagram, [96]
• Nautical astronomy, [5]
• New navigation, [102], [129]
• advantages of, [133]
• diagrams of, [135], [137]
• finding position without plotting on chart, [138]
• illustrated examples, [134]
• Notices to mariners, [151]
• Nutation, [32]
• P
• Parallax, [75]
• horizontal, [76]
• moon, [77]
• Parallel sailing, [3]
• Perigee, [139]
• Perihelion, [8]
• Plane sailing, [2]
• Planets, [6-7]
• Polaris, [88]
• diagram, [90]
• time to take sight, [92]
• Precession of the equinoxes, [27]
• causes of, [31]
• Prime vertical, [12]
• observations on, [103]
• Q
• Quadrature, [140]
• R
• Refraction, [71]
• Rhumb line, [149]
• Right ascension, [26], [50]
• S
• Sailings, [3]
• Seasons, the, [20]
• Semi-diameter, [69]
• Ship’s time, [40]
• Sidereal time, [43]
• (local) how to obtain, [52]
• longitude from, [53]
• year, [66]
• Solar system, [5]
• Summer, length of northern and southern, [25]
• lines, as chords and tangents, [112]
• when under the sun, [121]
• Sumner, Capt., his experience, [107]
• line, displacement of, [118]
• tangent method, [114]
• value of, [115]
• method, [107]
• Sun’s change in azimuth, [120]
• eastward movement, [16]
• T
• Time diagram, [51]
• Tropical year, [66]
• V
• Vega as a pole star, [31]
• Vernal equinox, [20]
• dates of, [67]
• Vertical circles, [12]
• W
• Weir’s azimuth diagram, [98]
• Z
• Zenith, [10]

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