The Venetian canon lawyer Paolo Sarpi had…
August 1609 CE
The Venetian canon lawyer Paolo Sarpi had received the report on Lippershey’s telescope in November 1607.
Based only on uncertain descriptions of the first practical telescope, Galileo, in the following year, had made a telescope with about 3x magnification.
He subsequently makes improved versions with up to about 30x magnification.
With a Galilean telescope, the observer can see magnified, upright images on the earth – it is what is commonly known as a terrestrial telescope, or spyglass.
He can also use it to observe the sky; for a time he is one of those who can construct telescopes good enough for this purpose.
He demonstrates his first telescope on August 25, 1609, to Venetian lawmakers.
His telescopes are a profitable sideline.
He can sell them to merchants who will find them useful both at sea and as items of trade.