Replica of telescope made by Galileo, 1610
Replica of one of the telescopes made by Galileo Galilei after he learnt of the invention of the telescope in 1608. The refracting telescope magnifies only 21 times yet gives a very restricted field of view. As a result Galileo was only able to view about a third of the Moon through his telescopes. Despite these limitations, Galileo published, 'Sidereus Nuncius' in 1610, which describes the new celestial sights he saw with his new telescope. These included craters on the Moon, the phases of Venus and the moons of Jupiter. This facsimile was made in 1923 at the Museo di Fisica e Storia Naturale, in Florence, Italy where the original still resides.
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