Astronomy for the use of schools and academies (1882)
Gillet, J. A. (Joseph Anthony), 1837-1908, Rolfe, W. J. (William James), 1827-1910 · New York : Potter, Ainsworth, & Co. · leaf 163
servers 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 of… … ASTRONOMY. 147 though, of course, beset with others, which, however, it ishoped will prove less formidable. (b) Of the micrometric method, as employed at the lasttransit, Professor Young speaks as follows : — The micrometric method requires the use of a heliometer,— an instrument common only in…
Astronomy
Internet Archive · Library of Congress · Public Domain Mark 1.0. Free to use for anything.
![An illustration from Novae coelestium terrestriumq[ue] rerum observationes : et fortasse hactenus non uulgatae (1646)](https://img.insideoutlibrary.com/img/200/ia-novaecoelestiumt00font-105-44.webp)
