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 119
... ecliptic ; the angle in which it crosses the equinoctiał the obliquity of the ecliptic ; * and the two points where it intersects that circle , the equinoxes . The obliquity of the ecliptic is a variable quantity , oscil . lating ...
... ecliptic ; the angle in which it crosses the equinoctiał the obliquity of the ecliptic ; * and the two points where it intersects that circle , the equinoxes . The obliquity of the ecliptic is a variable quantity , oscil . lating ...
Página 120
... ecliptic , or a circle of latitude passing through the body . 18. The latitude of a body is its distance from the ecliptic measured upon a secondary to that circle . And the angle formed at the body by two great circles , one passing ...
... ecliptic , or a circle of latitude passing through the body . 18. The latitude of a body is its distance from the ecliptic measured upon a secondary to that circle . And the angle formed at the body by two great circles , one passing ...
Página 121
... ecliptic are called solstices , because the sun when in either of them appears to be at a stand with regard to his decli- nation . 21. Colures are two secondaries to the equinoctial : one , passing through the equinoctial points , is ...
... ecliptic are called solstices , because the sun when in either of them appears to be at a stand with regard to his decli- nation . 21. Colures are two secondaries to the equinoctial : one , passing through the equinoctial points , is ...
Página 132
... ecliptic is traced , as well as its poles , the circles of latitude all intersecting mutually at those two poles , and then the parallels to the ecliptic . Thus , on the radius marked 270 ° , at a distance cr from the centre tan 11 ° 44 ...
... ecliptic is traced , as well as its poles , the circles of latitude all intersecting mutually at those two poles , and then the parallels to the ecliptic . Thus , on the radius marked 270 ° , at a distance cr from the centre tan 11 ° 44 ...
Página 133
... ecliptic Aнe to the equator ADQ . It is true , however , that the greatest in- equalities are out of the circle ADQB which is properly the projection . If we regard the circle #vix as a map of half the terrestrial globe , then xv , Y ...
... ecliptic Aнe to the equator ADQ . It is true , however , that the greatest in- equalities are out of the circle ADQB which is properly the projection . If we regard the circle #vix as a map of half the terrestrial globe , then xv , Y ...
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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