A Complete Epitome of Practical Navigation ...author, and sold, 1852 - 688 páginas |
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Página xi
... correct the Sun's Declination for the Changes in Periods of Four Years .......... 72 ......... 72 74 XIII . The Right Ascensions and Declinations of the principal Fixed Stars .... 76 XIV . The Sun's mean Right Ascension 77 XV . For ...
... correct the Sun's Declination for the Changes in Periods of Four Years .......... 72 ......... 72 74 XIII . The Right Ascensions and Declinations of the principal Fixed Stars .... 76 XIV . The Sun's mean Right Ascension 77 XV . For ...
Página xii
... Right Ascension , to any Time under the Meri- dian of Greenwich ........... 276 .... 278 ....... 283 XLVIII . The Parallax in Altitudes for Planets .... XLIX . For correcting the Logarithmic Difference when a Planet is observed ...
... Right Ascension , to any Time under the Meri- dian of Greenwich ........... 276 .... 278 ....... 283 XLVIII . The Parallax in Altitudes for Planets .... XLIX . For correcting the Logarithmic Difference when a Planet is observed ...
Página 146
... right angles . That vertical circle which passes through the east and west points of the horizon , is called the prime vertical . Celestial meridians , or circles of right ascension , are great circles passing through the poles of the ...
... right angles . That vertical circle which passes through the east and west points of the horizon , is called the prime vertical . Celestial meridians , or circles of right ascension , are great circles passing through the poles of the ...
Página 148
... right angles . The right ascension of a celestial body is an arch of the equinoctial , contained between the first point of Aries and that point of the equinoctial which is cut by a meridian passing through the object . The ascensional ...
... right angles . The right ascension of a celestial body is an arch of the equinoctial , contained between the first point of Aries and that point of the equinoctial which is cut by a meridian passing through the object . The ascensional ...
Página 149
... right ascension ; w , the ecliptic ; Rr its poles ; KLr a circle of longitude ; the tropic of Cancer ; ww the tropic of Capricorn ; R M the arctic circle ; and rm the antarctic circle . Then if v be the place of a star , v D will be its ...
... right ascension ; w , the ecliptic ; Rr its poles ; KLr a circle of longitude ; the tropic of Cancer ; ww the tropic of Capricorn ; R M the arctic circle ; and rm the antarctic circle . Then if v be the place of a star , v D will be its ...
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Términos y frases comunes
angle apparent distance arch Argo Navis Cape St centre Chro chronometer Co-sec Co-sine Co-tan Coast compass Corr correction corresponding course and distance degrees Diff difference of latitude difference of longitude Dist Ditto entr equal Equation EXAMPLE extent will reach feet given Greenwich mean horizon index error Island Latitude and Departure LATITUDES AND LONGITUDES Light line of numbers line of sines logarithm LOGARITHMIC SINES meridian altitude middle latitude miles minutes moon Moon's apparent altitude Natural Versed Nautical Almanac nonius noon North North Island observed altitude observer's eye parallel perpendicular planet Port Porto Santo Pulo radius Reef refraction remainder right ascension Rock sails Secant semidiameter sextant ship ship's Shoal sine South East Point South Point star Star's subtracted Sun's declination sun's lower limb Table taken Tang tangent true distance true longitude 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.