Note 7 — Chapter III · THE COOLING OF THE PLANETS.
Reading edition
“Saturn has a mean diameter that is about nine times that of Earth while his volume exceeds hers more than 700 times. Within an extreme span of upwards of four millions of miles on either side of Saturn’s globe there circle eight satellites and two millions of worlds, the least of which is probably as large as Mars. Then within the path of the innermost of these moons there is the wonderful ring system of Saturn. The span of this system of rings amounts to about 176,000 miles; that is its outermost edge lies about 88,000 miles from Saturn’s centre, while the complete system has a breadth of 37,600 miles, but the innermost part, to a breadth of nearly 9,000 miles is dark. Through this dark ring the outline of Saturn’s disc can be clearly perceived. In fact this wonderful dark ring is transparent. The bright parts of the system form two rings, separated from each other by a dark, but not perfectly black, circular division about 1700 miles broad.”
Proctor, “Expanse of the Heavens,” p. 96.