Elements of Plane and Spherical Trigonometry: With Its Applications to the Principles of Navigation and Nautical Astronomy. With the Logarithmic and Trigonometrical Tables |
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Page xi
... altitude of any celestial object 159 • 79. To determine the latitude by double altitudes 164 • 80. On finding the longitude by lunar observations 169 · ib . Three methods of deducing the true from the observed distance 81. On the ...
... altitude of any celestial object 159 • 79. To determine the latitude by double altitudes 164 • 80. On finding the longitude by lunar observations 169 · ib . Three methods of deducing the true from the observed distance 81. On the ...
Page 74
... p cos . A cos . m ' cos . a cos . p + sin . a sin . p cos . A ; therefore , since by hypothesis ab we have mm ' , that is , the arc bisecting the vertical angle also bisects the base , and 74 SPHERICAL TRIGONOMETRY . Of altitude.
... p cos . A cos . m ' cos . a cos . p + sin . a sin . p cos . A ; therefore , since by hypothesis ab we have mm ' , that is , the arc bisecting the vertical angle also bisects the base , and 74 SPHERICAL TRIGONOMETRY . Of altitude.
Page 135
... altitudes of celestial objects are measured . These vertical circles all meet in two points diametrically opposite , viz . the poles of the horizon ; that one which is directly over the head of the observer is called his zenith , and ...
... altitudes of celestial objects are measured . These vertical circles all meet in two points diametrically opposite , viz . the poles of the horizon ; that one which is directly over the head of the observer is called his zenith , and ...
Page 140
... altitude BS , and the azimuth BO from the north point O of the horizon ; or to find the complement AB of this azimuth , that is , the sun's bearing from the east . EXAMPLES . 1. What was the altitude and azimuth of Arcturus , when upon ...
... altitude BS , and the azimuth BO from the north point O of the horizon ; or to find the complement AB of this azimuth , that is , the sun's bearing from the east . EXAMPLES . 1. What was the altitude and azimuth of Arcturus , when upon ...
Page 141
... altitude and azimuth when on the six o'clock hour circle of Greenwich , lat . 51 ° 28 ′ 40 ′′ N. ? Altitude 12 ° 32 ′ 3 ′′ , Azimuth 79 ° 46 ′ 50 ′′ from N. PROBLEM IV . The latitude of the place and the declination of the sun being ...
... altitude and azimuth when on the six o'clock hour circle of Greenwich , lat . 51 ° 28 ′ 40 ′′ N. ? Altitude 12 ° 32 ′ 3 ′′ , Azimuth 79 ° 46 ′ 50 ′′ from N. PROBLEM IV . The latitude of the place and the declination of the sun being ...
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Common terms and phrases
ABC are given apparent altitude arc BC arith Asin called celestial sphere centre chord circle colatitude comp complement computation correction cosec cosine cotangent course and distance deduced departure determine diff difference of latitude difference of longitude direct course equal equations equinoctial expression find the angle formula given side Greenwich hence horizon hour angle hypotenuse included angle logarithmic measured meridian middle latitude miles Napier's Nautical Almanack negative oblique obtuse opposite angle parallax parallel parallel sailing perpendicular plane sailing plane triangle pole PROBLEM quadrant quantities radius right ascension right-angled triangle rule secant semidiameter ship sin.c sine sine and cosine solution sphere spherical angle spherical triangle spherical trigonometry subtracting supplement tabular line tangent third side three angles three sides triangle ABC trigono trigonometrical lines true altitude values vertical zenith
Popular passages
Page viii - In any plane triangle, the sum of any two sides is to their difference, as the tangent of half the sum of the opposite angles is to the tangent of half their difference.
Page 99 - B . sin c = sin b . sin C cos a = cos b . cos c + sin b . sin c cos b = cos a . cos c + sin a . sin c cos A cos B cos c = cos a . cos b + sin a . sin b . cos C ..2), cotg b . sin c = cos G.
Page 22 - In every plane triangle, the sum of two sides is to their difference as the tangent of half the sum of the angles opposite those sides is to the tangent of half their difference.
Page vi - An Elementary Treatise on Algebra, Theoretical and Practical; with attempts to simplify some of the more difficult parts of the Science, particularly the Demonstration of the Binomial Theorem in its most general form ; the Summation of Infinite Series ; the Solution of Equations of the Higher Order, &c., for the use of Students.
Page 160 - If the zenith distance and declination be of the same name, that is, both north or both south, their sum will be the latitude ; but, if of different names, their difference will be the latitude, of the same name as the greater.
Page 165 - PS' ; the coaltitudes zs, zs', and the hour angle SPS', which measures the interval between the observations ; and the quantity sought is the colatitude ZP. Now, in the triangle PSS , we have given two sides and the included angle to find the third side ss', and one of the remaining angles, say the angle PSS'. In the triangle zss...
Page 129 - To THE TANGENT OF THE COURSE ; So IS THE MERIDIONAL DIFFERENCE OF LATITUDE, To THE DIFFERENCE OF LONGITUDE. By this theorem, the difference of longitude may be calculated, without previously rinding the departure.
Page vi - MICHAEL O'SHANNESSY, AM 1 vol. 8vo. " The volume before us forms the third of an analytical course, which commences with the * Elements of Analytical Geometry.' More elegant t&xtbooks do not exist in the English language, and we trust they will speedily be adopted in our Mathematical Seminaries. The existence of such auxiliaries will, of itself, we hope, prove an inducement to the cultivation of Analytical Science ; for, to the want of such...
Page 69 - The sum of the three sides of a spherical triangle is less than the circumference of a great circle. Let ABC be any spherical triangle ; produce the sides AB, AC, till they meet again in D. The arcs ABD, ACD, will be semicircumferenc.es, since (Prop.
Page 138 - PEP' (Fig. 22,) represent the meridian of the place, Z being the zenith, and HO the horizon ; and let LL' be the apparent path of the sun on the proposed day, cutting the horizon in S. Then the...