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; Illustrated by Proper Rules and Examples: The Whole Exemplified in a Journal Kept from Boston to Madeira, ...

E. & G. W. Blunt, Proprietors, 1848 - Nautical astronomy - 777 pages

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Contents

 Signs and abbreviations used in this work 1 Demonstration of the most useful propositions of geometry 7 Demonstration of theorems in plane trigonometry 13 Construction of the plane scale 18 Description and use of the sector 25 Division by logarithms 31 Table of solutions of the various cases of trigonometry 37 A short introduction to astronomy and geography 45
 minutes of each other by one observer 178 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 in geography 51 A table of solutions of the several cases of plane sailing 53 Traverse sailing 59 Questions to exercise the learner in parallel sailing 65 + is the sign of division and signifies that the number that stands before it is to be divided 72 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 To adjust a sextant 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
 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 257 To correct the dead reckoning 263 Journal from Boston to Madeira 270 KLVIII Third correction in Lyonss improved method 275 Explanations of sea terms 288 Evolutions at 304 or Either of these marks is used for connecting numbers together thus 6 is the sign of equality and shows that the numbers or quantities placed before it 2 Suns parallax in altitude 89 to front the titlepage Plate VIII to front page 116 II to front page º IX to front page 136 136 Variation of the suns altitude in one minute from noon 239 Longitudes and latitudes of the fixed stars 245 245 Catalogue of the TABLEs with examples of the uses of those not explained in other 392 To find the horary motion of the moon 400 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 427 To find the longitude of a place by the moons passage over 434 Theorems in spherics 440