New American Practical Navigator

Front Cover
U.S. Government Printing Office, 1874 - Nautical astronomy
 

Contents

A short introduction to astronomy and geography
45
Examples in geography 31
48
Difference of latitude and departure for points 1
52
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
Gulf of St Lawrence
66
Table to correct the middle latitude
76
Table of solutions of the various cases of Mercators sailing
79
Construction and use of Mercators chart
87
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
122
Description and use of a quadrant of reflection
128
To adjust a sextant
134
Adjustments of a circle of reflection
138
Description and use of a portable transit instrument
145
Tables for correcting the adjustments of a transit instrument
151
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 double altitudes of the moon
160
To find the latitude by a meridian altitude of the sun or a fixed star
166
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 time at sea and regulate a watch
213
To find the apparent time by an altitude of a fixed star
219
Second method of working a lunar observation
230
Fourth method or Witchells improved method of finding the true distance
243
To calculate a planets altitude
249
To allow for the change of rate in a chronometer
259
Journal from Boston to Madeira
265
X1 Proportional parts 87
87
Refraction of the heavenly bodies XIII Dip of the horizon XIV Suns parallax in altitude XV Augmentation of the moons semidiameter
88
Dip for different heights and distances VII To find the correction and logarithm of a lunar observation when a star or either of the planets Venus Mar...
89
To find the correction and logarithm of a lunar observation when the sun is used
97
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 froin noon 243
243
Errors arising from a deviation of one minute in the parallelism of the surfaces of the central mirror 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
Third correction in Lyonss improved method 275
275
ANAMBAS ISLANDS
356
ANDAMAN
362
APO BANK
369
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
410
To calculate an eclipse of the sun
417
To calculate the beginning or end of an eclipse or occultation
425
Given the latitude of the moon and longitude of the moon and sun
433
eclipse
452
To find the longitude of a place from the beginning or end of an occul
468

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