Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 89
good observer, the right ascensionand declination of a star can be determined with anerror which is seldom more than 2. To form an ideaof 2 comparison may be made with the angular dia-meter of the Sun, which is 30 or 1800. By taking 78 ASTRONOMY the mean of several observations on different… … Diag. XLII. required is easily demonstrated by a pair of compasses.If one leg be pointed towards the pole, the other leg ASTRONOMICAL INSTRUMENTS 79 can be opened out to an angle equal to the polardistance of the star; then by turning about the legpointing to the pole the other leg may be brought…
Astronomy
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