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Demonstration of the mirror telescope prototype
On October 2, 1608 Hans Lippershey (a German-born Dutch inventor, optician and eyeglass maker, most likely creator of the telescope) presented his invention to the Dutch government. It was the prototype of the modern mirror telescope.
Lippershey demonstrated the operation of his invention, showing that it’s still possible to see the clock on the tower of a church in Delft from the tower in The Hague at a distance of about 15 kilometers. The demonstration was attended by many diplomats and statesmen.