Elementary astronomy; a beginner's text-book (1899)
Holden, Edward Singleton, 1846-1914 · New York, H. Holt and company · leaf 170
INSTRUMENTS. 149 Greenwich chronometer) at that instant, the ships west longitude isO — T, a known quantity. Thus a little instrument that can be held in the hand enables thenavigator to determine his position on the Earths surface with con-siderable accuracy and in a very few minutes. Sextant… … Fiu. 93 —The Local Time of an Observer Determined byMeasuring the Altitude of the Sun. strument is revolved, what circle of the celestial sphere does it traceout? If a star of known R.A. = A crosses the meridian at a clocktime T, what is the correction of the clock ? If the sidereal clock…
Astronomy
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