Astronomy, a handy manual for students and others (1918)
Dyson, Frank Watson, Sir, 1868-1939 · New York, E.P. Dutton & Co. · leaf 220
pose of finding some stars of measurable parallax,he discovered that many stars were double, and in1782 presented to the Royal Society a catalogue of 269double stars. He supposed at the time that thesewere only optically double, that is, were nearly in thesame line as seen from the Earth. His… … in the course of the year. He was, in fact, seekingto determine the parallax of a star, in the way whichwas successfully carried out by Bessel in 1831, andwhich is described in Chapter VIII. The observation of a double star will be understoodfrom Diagram LXXXI. If A and B are the two stars,…
Astronomy
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