The Complete Mathematical and General Navigation Tables: Including Every Table Required with the Nautical Almanc in Finding the Latitude and Longitude: with an Explanation of Their Construction, Use, and Application to Navigation and Nautical Astronomy, Trigonometry, Dialling, Gunnery, EtcSimpkin, Marshall, & Company, 1838 |
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Página 5
... according to Dr. Maskelyne , the horizontal de- pression is affected by terrestrial refraction , in the proportion of about one- tenth of the whole angle ; wherefore , if from the angle of horizontal depression 18.7 " we take away the ...
... according to Dr. Maskelyne , the horizontal de- pression is affected by terrestrial refraction , in the proportion of about one- tenth of the whole angle ; wherefore , if from the angle of horizontal depression 18.7 " we take away the ...
Página 15
... according as it is greater or less than the latter . - And , As 350 degrees increased by the observed height of Fahrenheit's ther- mometer , are to 400 degrees † , so is the mean refraction to the corrected refraction ; the difference ...
... according as it is greater or less than the latter . - And , As 350 degrees increased by the observed height of Fahrenheit's ther- mometer , are to 400 degrees † , so is the mean refraction to the corrected refraction ; the difference ...
Página 17
... according to the prefixed sign , will give the true correction at such subsequent given time . Note . In taking out the proportional parts for the intermediate minutes of right ascension from the upper part of the Table , or between the ...
... according to the prefixed sign , will give the true correction at such subsequent given time . Note . In taking out the proportional parts for the intermediate minutes of right ascension from the upper part of the Table , or between the ...
Página 25
... according as they are increasing or decreasing . Example . Required the sun's right ascension and declination , and also the equation of time , May 6th , 1824 , at 5:10 " , in longitude 64:45 west of the meri- dian of Greenwich ? • Mean ...
... according as they are increasing or decreasing . Example . Required the sun's right ascension and declination , and also the equation of time , May 6th , 1824 , at 5:10 " , in longitude 64:45 west of the meri- dian of Greenwich ? • Mean ...
Página 27
... according to circumstances , ) for the noon and midnight immediately preceding and following the Greenwich time , and find their difference ; which difference will express the variation of those elements in 12 hours . Enter the Table ...
... according to circumstances , ) for the noon and midnight immediately preceding and following the Greenwich time , and find their difference ; which difference will express the variation of those elements in 12 hours . Enter the Table ...
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Términos y frases comunes
90 degrees add the log angle of meeting answering approximate auxiliary angle celestial object co-secant co-sine co-tangent co-versed sine comp computed Constant log Corr correction course and distance decimal fraction departure Diff difference of latitude difference of longitude distance sailed earth equal equator Example find the Angle find the Difference fixed star given angle Given arch given log given side hence hypothenuse A C leg AC mean solar merid meridian meridional difference middle latitude miles minutes moon's apparent altitude moon's horizontal parallax multiplied natural number natural sine natural versed sine Nautical Almanac noon observation perpendicular B C plane PROBLEM prop proportional log quadrant radius reduced refraction right angled right ascension right-hand rising and setting secant semidiameter ship side A B side BC sidereal day spherical distance spherical triangle star's subtracted Table tabular tangent trigonometry true altitude tude versed sine supplement
Pasajes populares
Página 59 - Also, between the mean, thus found, .and the nearest extreme, find another geometrical mean, in the same manner ; and so on, till you are arrived within the proposed limit of the number whose logarithm is sought.
Página 206 - 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 258 - If two triangles have two angles of the one equal to two angles...
Página 59 - ... progression, to which those indices belong. Thus, the indices 2 and 3, being added together, make 5 ; and the numbers 4 and 8, or the terms corresponding to those indices, being multiplied together, make 32, which is the number answering to the index 5.
Página 59 - And, if the logarithm of any number be divided by the index of its root, the quotient will be equal to the logarithm of that root. Thus the index or logarithm of 64 is 6 ; and, if this number be divided by 2, the quotient will be = 3, which is the logarithm of 8, or the square root of 64.
Página 152 - RULE. Divide as in whole numbers, and from the right hand of the quotient point off as many places for decimals as the decimal places in the dividend exceed those in the divisor.
Página 153 - When there happens to be a remainder after the division ; or when the decimal places in the divisor are more than those in the dividend ; then ciphers may be annexed to the dividend, and the quotient carried on as far as required.
Página 154 - REDUCTION OF DECIMALS. CASE I. . To reduce a Vulgar Fraction to a Decimal Fraction of equal value.
Página 177 - II. The sine of the middle part is equal to the product of the cosines of the opposite parts.
Página 243 - II. the difference of latitude and departure corresponding to each course and distance, and set them in their respective columns : then the difference between the sums of the northings and southings will be the difference of latitude made good, of the same name with the greater ; and the difference between the sums of the eastings and westings will be the departure made good, of the same name with the greater quantity.