On 25 August 1609, he demonstrated his first telescope to Venetian lawmakers. His telescopes were a profitable sideline. He could sell them to merchants who found them useful both at sea and as items of trade. He published his initial telescopic astronomical observations in March 1610 in a brief treatise entitled Sidereus Nuncius (Starry Messenger).
Rok 2009 został przecież z racji tejże rocznicy uznany za Międzynarodowy Rok Astronomii (astronomia2009.pl)
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