A Complete Epitome of Practical Navigation ...author, and sold, 1852 - 688 páginas |
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Página 24
... longitude , the miles contained in one degree of longitude in that latitude ; the measure of a degree at the Equator being 60 miles . From the construction of the lines of chords , sines , and tangents , it is obvious that the 14 Plate ...
... longitude , the miles contained in one degree of longitude in that latitude ; the measure of a degree at the Equator being 60 miles . From the construction of the lines of chords , sines , and tangents , it is obvious that the 14 Plate ...
Página 56
... LONGITUDE of a place is an arch of the equator comprehended between the first meridian and that meridian which passes through the given place . It is usual to reckon longitude from the first meridian , either east or west , according as ...
... LONGITUDE of a place is an arch of the equator comprehended between the first meridian and that meridian which passes through the given place . It is usual to reckon longitude from the first meridian , either east or west , according as ...
Página 57
... longitude . When the sum of the two longitudes exceed 180 degrees , subtract it from 360 degrees , and the remainder will be the difference of longitude . EXAMPLE I. What is the difference ! of longitude between the Lizard and St ...
... longitude . When the sum of the two longitudes exceed 180 degrees , subtract it from 360 degrees , and the remainder will be the difference of longitude . EXAMPLE I. What is the difference ! of longitude between the Lizard and St ...
Página 58
... longitude be 220 miles : required her longitude in . Long . of St. Helena ...... 5 ° Diff . of longitude 220 or ... 3 45 ′ W. 40 E. Longitude in 2 5 W. EXAMPLE II . If a ship from longi- tude 176 ° 49 ′ W. sail westward till her ...
... longitude be 220 miles : required her longitude in . Long . of St. Helena ...... 5 ° Diff . of longitude 220 or ... 3 45 ′ W. 40 E. Longitude in 2 5 W. EXAMPLE II . If a ship from longi- tude 176 ° 49 ′ W. sail westward till her ...
Página 81
... longitude . Also , E O EC : AB AR . That is , As difference of longitude Is to radius , So is meridian distance To co . sine of latitude . Hence , if a triangle , as A B C ( see figure in Case I. ) , be so constructed that the longest ...
... longitude . Also , E O EC : AB AR . That is , As difference of longitude Is to radius , So is meridian distance To co . sine of latitude . Hence , if a triangle , as A B C ( see figure in Case I. ) , be so constructed that the longest ...
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Términos y frases comunes
angle Answer Apparent distance Arc second arch azimuth Bearing and Distance Chro chron Co-sec Co-sine Co-tan compass Corr correction corresponding course and distance degrees difference of latitude difference of longitude Dist Ditto East Equation EXAMPLE extent will reach feet given Greenwich mean Half-sum height horizon horizon-glass index error Latitude and Departure latitude by account logarithm LOGARITHMIC SINES meridian altitude middle latitude miles minutes moon Moon's apparent altitude Moon's horizontal parallax Natural Versed Nautical Almanac nonius noon North observed altitude observer's eye parallel perpendicular planet points Porto Santo radius refraction remainder required the latitude required the true right ascension sails Secant seconds sextant ship ship's sine South star subtracted Sun's declination sun's lower limb Sun's right ascension Sun's semidiameter Sun's true altitude Suvers taken Tang tangent true distance true longitude upper limb variation West zenith distance
Pasajes populares
Página 20 - A circle is a plane figure bounded by a curved line called the circumference, every point of which is equally distant from a point within called the center, Fig.
Página 17 - Multiply the index of the quantity by the index of the power to which it is to be raised, and the result will be the power required.
Página 16 - DIVISION BY LOGARITHMS. RULE. From the logarithm of the dividend subtract the logarithm of the divisor, and the number answering to the remainder will be the quotient required.
Página 159 - Astronomers, with a view of obtaining a convenient and uniform measure of time, have recourse to a mean solar day, the length of which is equal to the mean or average of all the apparent solar days in a year. An imaginary Sun, called the mean Sun...
Página 5 - LV. contains the times of high water on the full and change of the moon, with the vertical rise of the tide, at many ports, harbors.
Página 15 - Consequently, when the first three terms of a proportion are given, the fourth is found by multiplying the second and third terms together, and dividing the product by the first term.
Página 231 - ... will be double the altitude of the sun's limb above the horizontal plane ; to the half of which, if the semidiameter, refraction, and parallax be applied, the result will be the true altitude of the centre.
Página 20 - For the purpose of measuring angles, the circumference is divided into 360 equal parts, called degrees ; each degree into 60 equal parts, called minutes ; each minute into 60 equal parts called seconds.
Página 52 - TO THEIR DIFFERENCE ; So IS THE TANGENT OF HALF THE SUM OF THE OPPOSITE ANGLES', To THE TANGENT OF HALF THEIR DIFFERENCE.
Página 37 - ... division. Or the extent from any division to another on the line of meridional parts, applied to the line of equal parts, will give the meridional difference of latitude between the two places denoted by the divisions.