Electro astronomical atlas ... with explanatory notes, questions and answers (1874)
Spoor, J. W. (Joseph W.) · Albany, N.Y., Weed, Parsons and Company · leaf 112
d the fact that their movementsare performed in a direction nearly perpendicularto the plane in which the planet revolves aroundthe Sun. Another peculiarity, and this is foundnowhere else throughout the solar system, furtherdistinguishes Uranus — the direction of thesemovements is retrograde ; that… … The first satellite is but 128,000 miles, or abouthalf the distance of our Moon, from the planet.The most distant of the four of which we have cer-tain knowledge is 392,000 miles. Of these four, thetwo nearest, Ariel and Umbriel, were discoveredby Lassell and Otto Struve respectively ; the…
Astronomy
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