Astronomer Galileo demonstrated one of his earlier telescopes to Venetian lawmakers.
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NASA's Voyager 1 spacecraft entered interstellar space, becoming the first artificial object to do so.
The first daily passenger air service began, going from London to Paris.
Uruguay gained independence from Brazil, which is now celebrated as a National Holiday for Uruguayans.
Naturalists Chris Atkins and Michael Taylor discovered the world's tallest tree in Redwood National Park, California.
The doctrine of the Holy Trinity was established after the end of the Council of Nicaea.
