Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 165
two stars makes with the celestial meridian passing throughA. When we know the position-angle and the distance of two starswe know all that can be known about their relative situation. Hie diameters of planets can be measured with the micrometer. Photography.—If we put a photographic plate in the… … ASTRONOMICAL INSTRUMENTS. 145 If we stop the clock and allow a star to move by its diurnal motionacross part of the field of view it will leave a trail from the # Fig. 89. east to the west side of the plate. After the plate is developed,we shall have a map of all the stars and can measure their…
Astronomy
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