The heavens above: a popular handbook of astronomy (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908 · New York, Chicago, Potter, Ainsworth, & Co. · leaf 165
bservers with precisely similar telescopes, and side by side,often differ from each other five or six seconds ; and, where thetelescopes are not similar, the differences and uncertainties aremuch greater. . . . Astronomers, therefore, at present arepretty much agreed that such observations can be… … PLATE r.
Astronomy
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