Moulton, Forest Ray, 1872-1952 · New York, The Macmillan company · leaf 348
width of CH. IX, 182] THE PLANETS 301 about 11,000 miles. The distance across the whole ringsystem from one side to the other is about 172,600 miles. The rings of Saturn are inclined about 27° to the plane ofthe planets orbit and about 28° to the plane of the echptic.Consequently, they are observed… … Fig. 117. — Saturn. Photographed Nov. 19, 1911, with the 60-inch telescopeof the Mount Wilson Solar Observatory. jlQ and 117. When their plane passes through the earth,they appear to be a very thin hne and even entirely disap-pear from view for a few hours, as Barnard found whenobserving them with…
Astronomy
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