2 things science and human progress accomplished on this date.
1919
An eclipse confirms Einstein's relativity
During a total solar eclipse, Arthur Eddington's expedition measured starlight bending around the Sun by just the amount Einstein's general relativity predicted. The result made headlines worldwide and turned a bold theory into accepted science.
Edmund Hillary and Tenzing Norgay stood on the summit of Mount Everest, the first people known to reach the highest point on Earth. They spent about fifteen minutes at the top before starting the long descent.