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, in which All the Rules of Navigation are Introduced ... With an Appendix, Containing Methods of Calculating Eclipses of the Sun and Moon, and Occultations of the Fixed Stars ...

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E. & G. W. Blunt, 1849 - Nautical astronomy - 638 pages
 

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Contents

A short introduction to astronomy and geography
45
Examples in geography
48
Questions to exercise the learner in plane sailing
58
A table showing how many miles of meridian distance correspond to a degree of longi
64
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
115
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
Tables for correcting the adjustments of a transit instrument
151
Variation of the compass
158
On the dip of the magnetic needle 104
164
To find the time of the moons passing the meridian
170
To find the latitude by the moons meridian altitude
171
To estimate the effects of small errors in the observations
179
Second inethod
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
To correct the dead reckoning
263
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
Dip for different heights and distances 83
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
Table showing the variation of the altitude of an object arising from
251
SLVIII Third correction in Lyonss improved method 275
275
CATALOGUE OF THE TABLES with examples of the uses of those not explained in other
385
Addition and subtraction using the signs as in algebra
395
To find the altitude and longitude of the nonagesimal
402
To calculate the longitude of a place from the observed beginning
409
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
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 a solar
443

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