Inventor Alan Clark was granted his patent for the telescope.
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After nearly four and a half years of cataclysmic conflict, World War I ended.
Danish astronomer Tycho Brahe witnessed the supernova SN 1572.
Canada's second-largest city, Montreal, started dumping untreated waste in the Saint Lawrence River.
NASA launched the Gemini program's tenth and final crewed spacecraft, Gemini 12.
German polymath Gottfried Wilhelm Leibniz demonstrated integral calculus for the first time.