On October 20, 1520, Ferdinand Magellan's expedition enters the passage that will eventually bear his name. The expedition had probed the east South American coast for several months looking for a suspected shortcut to the Pacific Ocean. After putting ashore for the winter (seasons reversed in the southern hemisphere) for several months, the search had resumed just 3 days earlier. Magellan named the passage
Estrecho de Todos los Santos ("Strait of All Saints"). Spanish emperor Charles V, who sponsored the expedition, would later rename it the Strait of Magellan. The passage will remain among the most important seaways of the world until the construction of the Panama Canal, as it allows mariners the shortest passage between the Atlantic and Pacific Oceans without having to test the stormy waters around Cape Horn at South America's southern tip.
On October 20, 1797, the
USS Constitution is launched. A 3-masted, 44-gun heavy frigate, she is the third of six ships authorized for construction by the Naval Act of 1794. She would serve with distinction during the Barbary Coast War and in the War of 1812, earning the nickname "Old Ironsides" during her battle with the
HMS Guerriere. She circumnavigated the globe in the 1840's, served as a Naval Academy training ship during the Civil War, and was finally decommissioned in 1881. Several attempts to preserve her failed, and she was slated to be used for naval target practice in 1905 when a nationwide public outcry sparked Congress to authorize funds for her restoration. The
Constitution was re-entered on US Navy rolls as a commissioned vessel in 1931. Preserved as a museum ship in Boston, she remains the oldest commissioned warship afloat, and the world's oldest vessel still capable of sailing under her own power, which she last did on her 200th birthday in 1997 (below).
On October 21, 1983, the General Conference on Weights and Measures redefines the length of a meter. The Metric System dates back to the 1790's, when the French Academy of Sciences determined to create a worldwide standard scale for all measures. At that time, a meter (or metre, from the ancient Greek "metreo" meaning "to measure, count or compare") was defined as one ten millionth of the quarter meridian, the distance from the Equator to the North Pole along the meridian through Paris. The General Conference (CGPM) was established in 1875 and meets roughly every four years in Paris. The 17th CGPM, meeting in 1983, redefined the length of a meter as "the length of the path travelled by light in vacuum during a time interval of 1/299,792,458 of a second". Don't ask me why this was necessary; I can't find an explanation. The CGPM has met 26 times and has redefined some aspect of international measurement in some fashion each time. It is next scheduled to meet in 2022 and will no doubt fuck with what we think we know again.
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