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
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Contents

Directions for sailing from America to India
120
Of the logline and halfminute glass
126
Description and use of a sextant of reflection
133
To adjust a sextant
137
is the sign of division and signifies that the number that stands before it is to be divided
144
Description and use of a portable transit instrument
145
Tables for correcting the adjustments of a transit instrument
153
Variation of the compass
158
On the dip of the magnetic needle
164
To find the latitude by a meridian altitude of the sun or a fixed star
170
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
233
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
To correct the dead reckoning
263
Journal from Boston to Madeira
270
Third correction in Lyonss improved method
275
Explanations of sea terms
288
Evolutions at sea
304
or Either of these marks is used for connecting numbers together thus
6
Difference for degrees 17
17
Meridional parts 62
62
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
XXI For turning degrees and minutes into time and the contrary 131
131
Proportional logarithms 132
132
to front the titlepage Plate VIII to front page 116 II to front page ſº IX to front page 136 Ill to front page 48 X to front page 144
144
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
To reduce the numbers of Table XXXII to other given intervals from noon 243
243
Correction of the mean refraction for various heights of the thermometer and barometer 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
Equation of second differences
250
Catalogue of THE TABLEs with examples of the uses of those not explained in other
390
To find the horary motion of the moon
398
To calculate the moons parallax in latitude and longitude
404
To calculate the longitude of a place from the observed beginning
410
To calculate an eclipse of the sun
417
To calculate the beginning or end of an eclipse or occultation
425
To find the longitude of a place by the moons passage over
429
Given the right ascension and declination to find the longitude
435
To find the longitude of a place from the beginning or end of an occul
446

Common terms and phrases

anchor apparent altitude azimuth bearing cable calculation centre chronometer circle column compass Corr correct altitude correct central altitude corresponding Cosec cosine degrees diff difference of latitude difference of longitude Dist 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 logarithm lower limb mean meridian altitude meridional difference method middle latitude miles minutes moon moon's Nautical Almanac nearly noon º º object observed altitude parallax parallel Parallel Sailing passing the meridian perpendicular Plane Sailing points polar distance radius 90 refraction right ascension screw sea account secant semidiameter sextant ship ship's side sine ſº 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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