Untitled (Jupiter Long)

'But what exceeds all wonders, I have discovered four new planets and observed their proper and particular motions, different among themselves and from the motions of all the other stars; and these new planets move about another very large star [Jupiter] like Venus and Mercury, and perchance the other known planets, move about the Sun. As soon as this tract, which I shall send to all the philosophers and mathematicians as an announcement, is finished, I shall send a copy to the Most Serene Grand Duke, together with an excellent spyglass, so that he can verify all these truths'
(Galileo Galilei, Letter to the Tuscan Court, 30 Jan 1610, cited in A. van Heiden (ed.), Siderius Nuncius or The Sidereal Messenger, Houston 1989, p.18).