Star-land : being talks with young people about the wonders of the heavens (1891)
Ball, Robert S. (Robert Stawell), Sir, 1840-1913 · London ; Paris : Cassell & Co. · leaf 248
try 20 feet, forinstance, as the length of the pole; that will make 10 feet The Giant Planets. 233 in the mud, 5 feet in the water, and 5 feet outside. Thiswill not do; it is not long enough; we must try again ; andafter another guess or two, we see that a pole 40 feet longwill exactly answer. We… … Fig. 69.—Orbits of Uranus and Neptune. that they were obliged to use a sort of guessing, but veryintelligent guessing, I need hardly assure you. They pro-ceeded in this way (Fig. 69). They would draw a circle out-side Uranus, and then they would suppose that a planet wasrevolving in that circle.…
Astronomy
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