That [the moons of Jupiter] revolve in unequal circles is manifestly deduced from the
Chapter 1, Problem 21(choose chapter or problem)
That [the moons of Jupiter] revolve in unequal circles is manifestly deduced from the fact that at the longest elongation from Jupiter it is never possible to see two of these moons in conjunction, whereas in the vicinity of Jupiter they are found united two, three, and sometimes all four together. (Galileo Galilei, The
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