Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |
From inside the book
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Page xi
... let fall perpendicularly on the other , also from the same point an arc of a small circle perpendicular to both being described ; there are inves- tigated approximative formulæ for the distance between the two arcs and the difference of ...
... let fall perpendicularly on the other , also from the same point an arc of a small circle perpendicular to both being described ; there are inves- tigated approximative formulæ for the distance between the two arcs and the difference of ...
Page xxvi
... let fall on it from the stations 408. Processes for measuring a degree of a great circle perpendi- cular to the meridian , and a degree on a parallel of geo- graphical latitude - 409. Method of finding the latitude of a station by ...
... let fall on it from the stations 408. Processes for measuring a degree of a great circle perpendi- cular to the meridian , and a degree on a parallel of geo- graphical latitude - 409. Method of finding the latitude of a station by ...
Page 10
... let fall in the directions of normals , or perpendiculars , to the earth's surface , a curve line supposed to join the points in which the normals meet that surface will be the correct terrestrial meridian ; and if the earth be not a ...
... let fall in the directions of normals , or perpendiculars , to the earth's surface , a curve line supposed to join the points in which the normals meet that surface will be the correct terrestrial meridian ; and if the earth be not a ...
Page 35
... Let fall PR perpendicularly on AB ; then the angle PCB , being 45 degrees , PR and CR ( the sine and cosine of 45 ° ) are each equal to √ , and ER = 2 √1⁄2 + 1 ; also EC = √1 . Now the triangles ERP and ECP being similar to one ...
... Let fall PR perpendicularly on AB ; then the angle PCB , being 45 degrees , PR and CR ( the sine and cosine of 45 ° ) are each equal to √ , and ER = 2 √1⁄2 + 1 ; also EC = √1 . Now the triangles ERP and ECP being similar to one ...
Page 37
... let fall am , bn , and EG perpendicularly on PC : then ( Geom . , 10. Cyl . ) the rectangle DF . circum . EG is equal to the convex surface of the conical frustum , and the rectangle mn . circum . CM is equal ( 1 Cor . 14. Cyl . ) to ...
... let fall am , bn , and EG perpendicularly on PC : then ( Geom . , 10. Cyl . ) the rectangle DF . circum . EG is equal to the convex surface of the conical frustum , and the rectangle mn . circum . CM is equal ( 1 Cor . 14. Cyl . ) to ...
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Common terms and phrases
aberration altitude angular distance apparent ascension and declination astronomical axis azimuth bisected celestial body celestial sphere centre circle colatitude computed considered correction corresponding cotan degrees described determined diameter difference disk earth ecliptic ellipse equal equator equatorial equinoctial point error expressed fixed star formula given Greenwich heliocentric horary horizontal parallax hour angle instant instrument interval latitude latter let fall mean meridian micrometer moon moon's motion movement Nautical Almanac nearly node noon nutation obliquity observed obtained P'PR parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius vector refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter sidereal sidereal clock sine solar sphere spherical triangle star's station subtracted sun's supposed surface tangent telescope transit transit telescope Trigon variation vertical wire zenith distance zero