English: The recto of the letter in which Francesco Fonatana announced to the Grand Duke of Tuscany Ferdinando II de' Medici the discovery of the belts on Jupiter's disk. (Courtesy of the Archivio di Stato di Firenze)
The picture was taken before the restoration the letter underwent in 2009, in occasion of the exhibition "Astrum 2009: Astronomia e strumenti. Il Patrimonio storico italiano quattrocento anni dopo Galileo" (Musei Vaticani, 16 October 2009 - 16 Jenuary 2010), where it was displayed.
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