Galileo Galilei (1564-1642), first to devise and use a telescope for astronomical observations, discovered the moons of Jupiter, and the motion of sunspots across the solar disc - sign of a less than perfect sun, which also rotated!
(perfect sun; rotated; ) (Galileo Galilei; discovered; the moons of Jupiter) Context(Galileo Galilei discovered,List([0, 106))):(Galileo Galilei; discovered the moons of Jupiter to devise; T:first)
Galileo Galilei discovered,List([0, 106))
perfect sun Galileo Galilei Galileo Galilei
rotated discovered discovered the moons of Jupiter to devise
the moons of Jupiter
T:first