The New American Practical Navigator; Being an Epitome of Navigation; Containing All the Tables Necessary to be Used with the Nauticl AlmanacE. & G.W. Blunt, 1846 - 451 pages |
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Page vii
... passing the meridian . Table XXIX . contains the correction of the moon's altitude for parallax and refraction , corresponding to the parallax 57 ' 30 " . Tables XXX . and XXXI . are tables of proportional parts , taken from the ...
... passing the meridian . Table XXIX . contains the correction of the moon's altitude for parallax and refraction , corresponding to the parallax 57 ' 30 " . Tables XXX . and XXXI . are tables of proportional parts , taken from the ...
Page xii
... passing the meridian .. 161 Variation observed ..... 163 On the dip of the magnetic needle .... 164 To find the latitude by a meridian altitude of the sun or a fixed star . 166 To find the time of the moon's passing the meridian . 170 ...
... passing the meridian .. 161 Variation observed ..... 163 On the dip of the magnetic needle .... 164 To find the latitude by a meridian altitude of the sun or a fixed star . 166 To find the time of the moon's passing the meridian . 170 ...
Page xiv
... passing the meridian 230 XXIX . Correction of the moon's altitude for parallax and refraction XXX . To find the variation of the moon's declination , & c . XXXI . To find the sun's right ascension 230 231 .... 237 XXXII . Variation of ...
... passing the meridian 230 XXIX . Correction of the moon's altitude for parallax and refraction XXX . To find the variation of the moon's declination , & c . XXXI . To find the sun's right ascension 230 231 .... 237 XXXII . Variation of ...
Page 6
... passing through the other end , A , of the arc . XX . The COSINE of an arc is the sine of the complement of that arc , or of what that are wants of a quadrant ; thus , AH being a quadrant , the arc SH is the complement of the arc AS ...
... passing through the other end , A , of the arc . XX . The COSINE of an arc is the sine of the complement of that arc , or of what that are wants of a quadrant ; thus , AH being a quadrant , the arc SH is the complement of the arc AS ...
Page 46
... passes between an observer on the earth and a star , it is called an occultation of the star . The instant when the moon's limb first covers the star is called the immersion , and the moment of its reappearance is called the emersion ...
... passes between an observer on the earth and a star , it is called an occultation of the star . The instant when the moon's limb first covers the star is called the immersion , and the moment of its reappearance is called the emersion ...
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The New American Practical Navigator; Being an Epitome of Navigation ... Nathaniel Bowditch No preview available - 2015 |
Common terms and phrases
anchor apparent altitude azimuth bearing cable calculation central index centre chord chronometer circle column compass Corr correct central altitude corresponding Cosec cosine degrees diameter diff difference of latitude difference of longitude Dist divided draw elapsed equal equator error EXAMPLE feet given Greenwich Half-sum horizon glass horizontal parallax hour angle hypotenuse instrument latitude and departure line of numbers line of sines logarithm lower limb mast mean meridian altitude method middle latitude miles minutes moon moon's multiplied Nautical Almanac nearly noon object observed altitude obtained parallel Parallel Sailing passing the meridian perpendicular Plane Sailing points polar distance pole quadrant radius 90 refraction right ascension rule screw sea account secant semidiameter sextant ship ship's side star subtracted sun's declination Suppose taken tangent telescope triangle true altitude true distance true longitude variation wind wires zenith distance
Popular passages
Page 9 - The angle in a semicircle is a right angle ; the angle in a segment greater than a semicircle is less than a right angle ; and the angle in a segment less than a semicircle is greater than a right angle.
Page 299 - Calm Light air Light breeze Gentle breeze Moderate breeze Fresh breeze Strong breeze Moderate gale Fresh gale Strong gale Whole gale Storm Estimatin Observations at sea Sea like mirror.
Page 156 - ... or taking their difference when of contrary names ; the altitude to be reckoned from the south point of the horizon, when the latitude is north, and the contrary when south ; but when the sum exceeds 90°, it is to be taken from 180°...
Page 10 - In like manner, when it is said, that " triangles on the same base, and between the same parallels, are equal...
Page 102 - If the vessel be double-decked, take the length thereof from the fore part of the main stem, to the after part of the stern post, above the upper deck ; the breadth thereof at the broadest part above the main wales...
Page 29 - To find the logarithm of a vulgar fraction. RULE. Subtract the logarithm of the denominator from the logarithm of the numerator...
Page 6 - The VERSED SINE of an arc is that part of the diameter which is between the sine and the arc.
Page 119 - Fiini will be the time of high water, at the given place, reckoning from the noon of the given day. If this sum be greater than 12h.
Page 290 - Davit ; a long beam of timber, used as a crane, whereby to hoist the flukes of the anchor to the top of the bow, without injuring the planks of the ship's sides as it ascends.
Page 11 - KCML, the sum of the two parallelograms or square BCMH ; therefore the sum of the squares on AB and AC is equal to the square on BC.