Elements of Plane and Spherical Trigonometry: With Their Applications to Heights and Distances Projections of the Sphere, Dialling, Astronomy, the Solution of Equations, and Geodesic OperationsBaldwin, Cradock, and Joy, 1816 - 244 páginas |
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Página 136
... latitude of the place , or EL . 6. While those dials whose planes are parallel to the plane of the horizon are called horizontal dials ; such as have their planes perpendicular to the horizon are called erect dials . 7. Those erect ...
... latitude of the place , or EL . 6. While those dials whose planes are parallel to the plane of the horizon are called horizontal dials ; such as have their planes perpendicular to the horizon are called erect dials . 7. Those erect ...
Página 138
... latitude of the place ; za 1 , the inclination of the plane ; OT HID , its declination ; Ps drawn per- pendicular to MT will be the position of the substyle ; and мb is the inclination of the hour line to the meri- dian . Now , we may ...
... latitude of the place ; za 1 , the inclination of the plane ; OT HID , its declination ; Ps drawn per- pendicular to MT will be the position of the substyle ; and мb is the inclination of the hour line to the meri- dian . Now , we may ...
Página 141
... latitude . Here , since the style is parallel to the plane , the dial has no centre ; all the hour lines , therefore , are parallel to the substylar line , which is the hour line of 6 o'clock : the respective distances of the hour lines ...
... latitude . Here , since the style is parallel to the plane , the dial has no centre ; all the hour lines , therefore , are parallel to the substylar line , which is the hour line of 6 o'clock : the respective distances of the hour lines ...
Página 142
... latitude of 90 ° . In any other latitude , mak- ing the terms of the equation homogeneous , we have sin 90 ° tan H = sin L tan P. Hence , if two radii be assumed in the ratio of sin 90 ° to sin L , tan H referred to the former radius ...
... latitude of 90 ° . In any other latitude , mak- ing the terms of the equation homogeneous , we have sin 90 ° tan H = sin L tan P. Hence , if two radii be assumed in the ratio of sin 90 ° to sin L , tan H referred to the former radius ...
Página 143
... latitude of the place , and from 12 let fall the perpendicular 12r upon HF . Make 12P , upon H12 prolonged , equal to 12r . From P draw lines P1 , P2 , P3 , & c . ( to terminate in the line 12-5 , perpendicular to 12H ) and to make ...
... latitude of the place , and from 12 let fall the perpendicular 12r upon HF . Make 12P , upon H12 prolonged , equal to 12r . From P draw lines P1 , P2 , P3 , & c . ( to terminate in the line 12-5 , perpendicular to 12H ) and to make ...
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Términos y frases comunes
altitude angled spherical triangle azimuth base becomes bisect centre chap chord circle circle of latitude computation consequently cos² cosec cosine cotangent declination deduced determine dial diameter difference distance draw earth ecliptic equa equal equation Example find the rest formulæ given side h cos h half Hence horizon hour angle hypoth hypothenuse intersecting latitude logarithmic longitude measured meridian obliq oblique opposite angle parallel perpendicular plane angles plane triangle pole problem prop quadrant radius right angled spherical right angled triangle right ascension right line sec² secant sin A sin sin² sine solid angle sphere spherical excess spherical trigonometry star substyle sun's supposed surface tan² tangent theorem three angles three sides tion triangle ABC values versed sine versin vertical angle whence zenith