Practical Astronomy and Geodesy: including the projections of the Sphere and Spherical TrigonometryLongman, Brown, Green and Longmans, 1845 |
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Page viii
... considered as infinitely great with respect to the group 16. Trace of the ecliptic ; its poles : circles of celestial longitude - 17. Division of the ecliptic into signs . - Direct and retrograde movements defined 18. The equator and ...
... considered as infinitely great with respect to the group 16. Trace of the ecliptic ; its poles : circles of celestial longitude - 17. Division of the ecliptic into signs . - Direct and retrograde movements defined 18. The equator and ...
Page 8
... considered as infinitely small when the imaginary sphere of the fixed stars is represented by one of any finite magnitude . Hence , in describing the systems of circles by which the apparent places of celestial bodies are indicated , it ...
... considered as infinitely small when the imaginary sphere of the fixed stars is represented by one of any finite magnitude . Hence , in describing the systems of circles by which the apparent places of celestial bodies are indicated , it ...
Page 13
... considered as unity ) ; and this method , which has been much used in the formation of geographical maps , is sometimes called the Globular pro- jection . The second is that in which the eye is supposed to be infinitely distant from the ...
... considered as unity ) ; and this method , which has been much used in the formation of geographical maps , is sometimes called the Globular pro- jection . The second is that in which the eye is supposed to be infinitely distant from the ...
Page 32
... considered now as rectilineal , will be similar to one another . Hence АР : PB PB : PC , PB PC PC PD , & c . Thus ... considered as a logarithmic spiral . Scholium . The curve on the sphere , or in the projection , is usually ...
... considered now as rectilineal , will be similar to one another . Hence АР : PB PB : PC , PB PC PC PD , & c . Thus ... considered as a logarithmic spiral . Scholium . The curve on the sphere , or in the projection , is usually ...
Page 33
... considered as unity . 46. When a portion of the surface of a sphere is projected gnomonically , and the plane of pro- jection is a tangent to the sphere at one of the poles of the equator , the terrestrial meridians , or the circles of ...
... considered as unity . 46. When a portion of the surface of a sphere is projected gnomonically , and the plane of pro- jection is a tangent to the sphere at one of the poles of the equator , the terrestrial meridians , or the circles of ...
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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