Practical Astronomy and Geodesy: Including the Projections of the Sphere and Spherical Trigonometry. For the Use of the Royal Military CollegeLongman, Brown, Green, and Longmans, 1845 - 427 pages |
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Page 7
... called the poles of the ecliptic . Now , if planes be supposed to pass through p and q , these planes will be perpendicular to that of the ecliptic , and they will cut the celestial sphere in the circumferences of circles which are called ...
... called the poles of the ecliptic . Now , if planes be supposed to pass through p and q , these planes will be perpendicular to that of the ecliptic , and they will cut the celestial sphere in the circumferences of circles which are called ...
Page 8
... called fixed , though examined with the most powerful instruments , are seen only as lucid points ; it will follow that the sun , the earth , and the planets constitute a particular group of bodies , and that a sphere supposed to ...
... called fixed , though examined with the most powerful instruments , are seen only as lucid points ; it will follow that the sun , the earth , and the planets constitute a particular group of bodies , and that a sphere supposed to ...
Page 9
... called the poles of the ecliptic . Now , if planes be supposed to pass through p and q , these planes will be perpendicular to that of the ecliptic , and they will cut the celestial sphere in the circumferences of circles which are called ...
... called the poles of the ecliptic . Now , if planes be supposed to pass through p and q , these planes will be perpendicular to that of the ecliptic , and they will cut the celestial sphere in the circumferences of circles which are called ...
Page 10
... called the latitude of such star : ps or q s is called its ecliptic polar distance . A plane passing through any point , parallel to the ecliptic E L , will cut the celestial sphere in the circumference of a circle which is called a ...
... called the latitude of such star : ps or q s is called its ecliptic polar distance . A plane passing through any point , parallel to the ecliptic E L , will cut the celestial sphere in the circumference of a circle which is called a ...
Page 11
... called azimuthal or vertical circles : their circumferences evidently intersect each other in the zenith and nadir ... called the azimuth , and an arc of a vertical circle between the horizon and the celestial body is called the altitude ...
... called azimuthal or vertical circles : their circumferences evidently intersect each other in the zenith and nadir ... called the azimuth , and an arc of a vertical circle between the horizon and the celestial body is called the altitude ...
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Common terms and phrases
angular distance apparent ascension and declination astronomical azimuth bisected celestial body celestial sphere centre circle passing circumference colatitude computed considered correction corresponding cosine cotan degrees described determined diameter difference earth ecliptic ellipse equal equator equatorial equinoctial point expressed fixed star formula geocentric given graduation Greenwich Greenwich mean horary motions horizontal parallax hour angle index error instant instrument interval latitude latter let fall limb longitude mean noon meridian micrometer moon moon's Nautical Almanac node observed altitude obtained optical axis orbit parallax parallel perihelion perpendicular plane passing polar distance pole position projection radius refraction represented revolution revolve right angles right ascension satellite screw sector semidiameter side sidereal sidereal clock sine sphere spherical triangle star's station subtended subtracted supposed surface tangent transit telescope true variation vertical wire zenith distance zero
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