Using the Paris Observatory (completed in 1672), Christiaan Huygens made further astronomical observations. In 1684 he published Astroscopia Compendiaria which presented his new aerial (tubeless) telescope.
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400 Years of the Telescope ProjectWORD September 6, 2008
The 400 Years of the Telescope project is an exciting multimedia celebration of Galileo's first telescopic observations of the cosmos, and the resulting journey of discovery for humanity.