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Auwers deduced from the German heliometric measures the unsatisfactorily small value of 92,000,000 miles. The transit of 1882 had not, then, brought about the desired unanimity. The state and progress of knowledge on this important topic were summed up by Faye and Harkness in 1881. Each has its special difficulties and sources of error; each has counter-balancing advantages.
Harold Jacoby similarly ascertained the fixity of seventy-five of Rutherfurd's Atlantids, between the epoch 1873 and that of Dr. Elkin's heliometric triangulation of the cluster in 1886, extending the interval to twenty-seven years by subsequent comparisons with plates taken at Lick, September 27, 1900.
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