The Complete Mathematical and General Navigation Tables: Including Every Table Necessary to be Used with the Nautical Almanac in Finding the Latitude and Longitude : with Their Description and Use, Comprising the Principles of Their Construction, and Their Direct Application to Plane and Spherical Trigonometry, Navigation, Nautical Astronomy, Dialling, Practical Gunnery, Mensuration, Guaging &c. &c, Τόμος 1Baldwin and Cradock, 1828 - 664 σελίδες |
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Αποτελέσματα 1 - 5 από τα 79.
Σελίδα 4
... opposite angles will be equal . ( Euclid , Book I. , Prop . 15. ) In this case it is evident that the arc or apparent altitude S D is too little ; and that it must be augmented by the arc DH = the angle of horizontal depression FOQ , in ...
... opposite angles will be equal . ( Euclid , Book I. , Prop . 15. ) In this case it is evident that the arc or apparent altitude S D is too little ; and that it must be augmented by the arc DH = the angle of horizontal depression FOQ , in ...
Σελίδα 6
... opposite to which , in the following column , stands the corresponding correction ; which is to be subtracted from the observed altitude of a celestial object when taken by the fore observation ; but to be added thereto when the back ...
... opposite to which , in the following column , stands the corresponding correction ; which is to be subtracted from the observed altitude of a celestial object when taken by the fore observation ; but to be added thereto when the back ...
Σελίδα 7
... opposite to the perpendicular : hence , since the base and perpendicular of that triangle are known , we have the following general - Rule . As the base or ship's distance from the land , is to the radius , so is the perpendicular , or ...
... opposite to the perpendicular : hence , since the base and perpendicular of that triangle are known , we have the following general - Rule . As the base or ship's distance from the land , is to the radius , so is the perpendicular , or ...
Σελίδα 12
... opposite the former , stands the corresponding parallax in altitude ; which is always to be applied by addition to the planets ap- parent altitude . Hence , if the apparent altitude of a planet be 30 degrees , and its horizontal ...
... opposite the former , stands the corresponding parallax in altitude ; which is always to be applied by addition to the planets ap- parent altitude . Hence , if the apparent altitude of a planet be 30 degrees , and its horizontal ...
Σελίδα 13
... opposite to which , in the adjoining column , stands the corresponding parallax in altitude ; - thus , the parallax answering to 10 : apparent altitude is 9 seconds ; that answering to 40 : apparent altitude is 7 seconds , & c . & c ...
... opposite to which , in the adjoining column , stands the corresponding parallax in altitude ; - thus , the parallax answering to 10 : apparent altitude is 9 seconds ; that answering to 40 : apparent altitude is 7 seconds , & c . & c ...
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Συχνά εμφανιζόμενοι όροι και φράσεις
24 hours ascension at noon auxiliary angle celestial object co-secant co-sine co-tangent column computed Constant log Correction of ditto corresponding course and distance decimal declination at noon degrees departure Diff difference of latitude difference of longitude dist east equation Example fixed star Greenwich Half sum hence horizontal parallax hypothenuse King's Island leg AC mean merid meridian meridian of Greenwich meridional altitude meridional difference middle latitude miles minutes moon's apparent altitude Moon's reduced Moon's true natural number natural versed sine Nautical Almanac observed altitude perpendicular place of observation planet's Port Jackson Problem Prop proportional log radius reduced right ascension refraction required the true RULE secant seconds semi-diameter side A B spherical distance spherical triangle spherical trigonometry subtracted sun's declination sun's lower limb Sun's reduced right Sun's right ascension Table tangent true altitude true central altitude true central distance watch
Δημοφιλή αποσπάσματα
Σελίδα 19 - Given two sides and the included angle, to find the third side and the remaining angles. The sum of the required angles is found by subtracting the given angle from 180°. The difference of the required angles is then found by Theorem II. Half the difference added to half the sum gives the greater angle, and, subtracted, gives the less angle.
Σελίδα 484 - AZIMUTH, in astronomy, an arch of the horizon, intercepted between the meridian of the place and the azimuth, or vertical circle passing through the centre of the object, which...
Σελίδα 212 - 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.
Σελίδα 63 - 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.
Σελίδα 63 - 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.
Σελίδα 487 - ... reckoned from the north in north latitude, but from the south in south latitude. » In observations of the altitude of the sun'< loiter limb (by afore enervation) it is u«u»l to »<M 12' for tic cBecl of dip, parallax, ami sern diameter.
Σελίδα 159 - 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.
Σελίδα 681 - The Young Navigator's Guide to the Sidereal and Planetary Parts of Nautical Astronomy.
Σελίδα 649 - ... position with respect to a luminous body, can cast a circular shadow ; likewise all calculations of eclipses, and of the places of the planets, are made upon supposition that the earth is a sphere, and they all answer to the true times when accurately calculated. When an eclipse of the moon happens, it is observed sooner by those who live eastward than by those who live westward ; and, by frequent experience, astronomers have determined that, for every fifteen degrees difference of longitude,...
Σελίδα 183 - II. The sine of the middle part is equal to the product of the cosines of the opposite parts.