 | Jacques Ozanam - Scientific recreations - 1803 - 660 pages
...which if produced would pass through the pole, are of this number. The meridian line, as is well known, is the intersection of the plane of the meridian with the plane of the dial ; when the plane of the dial is vertical, it is always perpendicular to the horizon. The substylar... | |
 | Jacques Ozanam - 1840 - 850 pages
...which if produced would pass through the pole, are of this number. The meridian line, as is well known, is the intersection of the plane of the meridian with the plane of the dial ; when the plane of the dial is vertical, it is always perpendicular to the horizon. The subetylar... | |
 | William Chauvenet - Astronomical instruments - 1863 - 764 pages
...altitude by ^ Art. 268. At any point C of this line draw CM perpendicular to A A', and let A'GS'be the meridian passing through C; then SCM is evidently...belongs to geodesy. 273. By the meridian passage of a star. — If the precise instant when a star arrives at its greatest altitude could be accurately distinguished,... | |
 | William Chauvenet - 1864 - 720 pages
...The solution is but approximate, since AA' should be a curve line, and the azimuth of the normal CAT would be different for different points of AA'. It...belongs to geodesy. 273. By the meridian passage of a star. — If the precise instant when a star arrives at its greatest altitude could be accurately distinguished,... | |
 | William Chauvenet - Astronomical instruments - 1891 - 714 pages
...position line on the chart, derived from an observed altitude by Art. 268. At any point C of this Hue draw CM perpendicular to A A', and let NCS be the...belongs to geodesy. 273. By the meridian passage of a star. — If the precise instant when a star arrives at its greatest altitude could be accurately distinguished,... | |
 | Sir Norman Lockyer - Astronomy, Egyptian - 1893 - 468 pages
...point overhead) at that place and the poles of the celestial sphere. The meridian line at any place is the intersection of the plane of the meridian with the plane of the horizon at that place, or, in other words, it is the line joining the north and south points. If we have the... | |
 | William Chauvenet - Astronomical instruments - 1900 - 722 pages
...36) be a position line on the chart, derived from an observed altitude by Art. 268. At any point Cof this line draw CM perpendicular to A A', and let NCS...belongs to geodesy. 273. By the meridian passage of a star. — If the precise instant when a star arrives at its greatest altitude could be accurately distinguished,... | |
 | Astronomy - 1901 - 822 pages
...the trough. It follows from this and the fact that the axis of rotation is vertical that the line of intersection of the plane of the meridian with the plane of the photographic plate is the same line on the plate before and after rotation. FLOATING PHOTOGRAPHIC ZENITH... | |
 | Royal Astronomical Society - Astronomy - 1901 - 1106 pages
...the trough. It follows from this and the fact that the axis of rotation is vertical that the line of intersection of the plane of the meridian with the plane of the photographic plate is the same line on the plate before and after rotation. The trough, A, and float,... | |
 | George Leonard Hosmer - Spherical astronomy - 1903 - 78 pages
...sea. 7. The Meridian is the great circle passing through the poles and the zenith of the observer. The intersection of the plane of the meridian with the plane of the horizon is the meridian line used by the surveyor. 8. The Prime Vertical is the great circle which passes through... | |
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AA'. It is, however, quite accurate enough for the purpose of determining the variation of the compass at sea, which is the only practical application of this problem. CHAPTER IX. THE MERIDIAN LINE AND VARIATION OF THE COMPASS. 272. THE meridian line... 