Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 87
e star iswatched as it moves and the exact time is noted whenthe several vertical wires are crossed. Formerly thetiming was done by the observer listening to the beats of a clock, carrying theseconds in his head andestimating the tenths ofseconds. An easier methodnow in general use is toregister… … ASTRONOMICAL INSTRUMENTS 77 easily calculated, the exact moment at which the starcrosses the meridian, i. e. the right ascension. To obtain the stars declination it is necessary todetermine the altitude at which the telescope ispointed. For this purpose a large graduated circle isfixed centrally on…
Astronomy
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