The New American Practical Navigator: Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nautical Almanac in Determining the Latitude, and the Longitude by Lunar Observations, and Keeping a Complete Reckoning at Sea ... the Whole Exemplified in a Journal Kept from Boston to Madeira ... with an Appendix, Containing Methods to Calculating Eclipses of the Sun and Moon, and Occultations of the Fixed Stars ...

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E. & G. W. Blunt, 1841 - Nautical astronomy - 636 pages
 

Selected pages

Contents

Table of solutions of the various cases of trigonometry
37
A short introduction to astronomy and geography
45
Examples in geography
51
Plane sailing
62
Table of solutions of the several cases of middle latitude sailing
68
Table to correct the middle latitude
76
Table of solutions of the various cases of Mercators sailing
79
To work a compound course by middle latitude or Mercators sailing
86
To find the difference between the true and apparent directions of the wind
97
Gauging
103
To survey a coast in sailing along shore
109
To reduce soundings taken at any time of the tide to low water
113
Tides
120
Of the logline and halfminute glass
126
Description and use of a sextant of reflection
133
Description and uses of the circle of reflection
137
Verification of the mirrors and colored glasses
143
To observe the transit of any heavenly body over the meridian
150
To find the distance of the land in order to calculate the dip
155
To calculate the true amplitude
159
To find the latitude by a meridian altitude of the sun or a fixed star
166
To find the latitude by the moons meridian altitude
171
To estimate the effects of small errors in the observations
179
Second method
185
Questions to exercise the learner in working double altitudes
193
To find the latitude by one altitude of the sun having your watch previously regulated
200
To find the latitude by the polar star
206
To find the time at sea by the moons altitude
213
To regulate a chronometer by equal altitudes of the sun
219
To find the longitude at sea by lunar observations
225
Examples of lunar observations
232
Second method of working a lunar observation
239
Table of corrections for second differences
245
Method of combining several lunar observations and determining the error of the chro
251
To allow for the change of rate in a chronometer
257
Right ascensions and declinations of the fixed stars 80
80
Suns rising and setting 84
84
For finding the distance of terrestrial objects at sea 86
86
Proportional parts 87
87
Refraction of the heavenly bodies 88
88
To find the correction and logarithm of a lunar observation when a star or either of the planets Venus Mars Jupiter or Saturn is observed 89
89
To find the correction and logarithm of a lunar observation when the sun is used 97
97
To find the correction and logarithm of a lunar observation depending on the moons altitude 98
98
For finding the third correction of a lunar observation 130
130
For turning degrees and minutes into time and the contrary 131
131
Proportional logarithms 132
132
For finding the latitude by two altitudes of the sun 148
148
Natural sines and cosines 160
160
Log sines tangents c to points and quarter points 169
169
To find the time of the moons passing the meridian 230
230
To find the variation of the moons declination c 231
231
To find the suns right ascension 237
237
Variation of the suns altitude in one minute from noon 239
239
To reduce the numbers of Table XXXII to other given intervals from noon 243
243
Errors arising from a deviation of the telescope from a plane parallel to the plane of the instrument 244
244
Longitudes and latitudes of the fixed stars 245
245
Reductions of latitude and horizontal parallax 246
246
Aberration of the fixed stars in right ascension and declination 247
247
Nutation in right ascension and declination 248
248
Augmentation of the moons semidiameter found by the nonagesimal 249
249
CATALOGUE OF THE TABLES with examples of the uses of those not explained in other
390
Problem II
398
To calculate the longitude of a place from the observed beginning
407
To project an eclipse of the moon
415
To project an occultation of a fixed star
421
To find the longitude of a place by measuring the distance of the moon
427
Given the latitude of the moon and longitude of the moon and sun
433
Redfields theory of storms
440
To find the longitude of a place from the beginning or end of an occul
446

Common terms and phrases

anchor apparent altitude azimuth cable calculation centre chord chronometer circle column compass Corr correct altitude correct central altitude corresponding Cosec cosine degrees diameter Diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet Funchal given Greenwich Half-sum horizon glass horizontal parallax hour angle hypotenuse instrument latitude and departure line of numbers line of sines logarithm lower limb mean meridian altitude meridional difference method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude parallel Parallel Sailing passing the meridian perpendicular Plane Sailing polar distance quadrant radius 90 refraction right ascension RULE sea account secant semidiameter sextant ship ship's side star subtracted sun's declination Suppose taken tangent telescope traverse table triangle true altitude true distance variation wind wires zenith distance

Bibliographic information

QR code for The New American Practical Navigator
TitleThe New American Practical Navigator: Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nautical Almanac in Determining the Latitude, and the Longitude by Lunar Observations, and Keeping a Complete Reckoning at Sea ... the Whole Exemplified in a Journal Kept ...
AuthorJonathan Ingersoll Bowditch
Edition12
PublisherE. & G. W. Blunt, 1841
Original fromthe New York Public Library
DigitizedAug 19, 2009
Length636 pages
  
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