...These phases were discovered by Galileo, in 1610... 
Camille Flammarion Frances A. Welby 「Astronomy for Amateurs」
...It is not certain whether Galileo, Fabricius, or Schemer was the first to seethe spots...
George Forbes 「History of Astronomy」
...The ring was a complete puzzle to Galileo, most of all when the planet reacheda position where the plane of the ring was in line with the earth, and the ringdisappeared (December 4th, 1612)...
George Forbes 「History of Astronomy」
...At the expirationof a few months Galileo was ordered to return to Arcetri, which he neverleft again...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...It is also probable that the information communicatedby Galileo, or by some of his followers, may have persuaded Milton toentertain a more favourable opinion of the Copernican theory...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...The evidence in support of the existence of Jupiter’s satellites becameso conclusive that the opponents of Galileo were compelled to renouncetheir disbelief in those bodies, whether real or pretended...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...’Continuing his observations, Galileo perceived that the two lateralobjects gradually decreased in size, and at the expiration of two yearsentirely disappeared, leaving the central globe visible only...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
...They all had a common motion, and appeared to rotate withthe Sun, from which Galileo concluded that the orb rotated on his axisin about twenty-eight days...
Thomas Orchard 「The Astronomy of Milton's 'Paradise Lost'」
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