
| Prince Henry the Navigator, sponsor of Portuguese exploration. | |
| Antonio Vivaldi, late Baroque violin virtuoso and composer. | |
| John Flamsteed appointed first Astronomer Royal of England. | |
| Congress declares the Constitution to be in effect. | |
| Vermont admitted as 14th state. | |
| Oranges introduced to Hawaii. | |
| Shortest inauguration speech, 133 words, Washington (2nd time). | |
| Jefferson is the first President inaugurated in Washington, DC. | |
| First US railroad chartered, the Granite Railway in Quincy, Mass. | |
| Longest inauguration speech, 8443 words, William Henry Harrison. | |
| Confederate States adopt 'Stars & Bars' flag | |
| American Automobile Association (AAA) founded. | |
| Roosevelt inaugurated, 'We have nothing to fear but fear itself' | |
| Easter Cross on Mt. Davidson dedicated. | |
| First radio facsimile transmission is sent across the continent. | |
| Pioneer 4 makes first US lunar flyby. | |
| Orbiting Geophysical Observatory 5 launched | |
| First CRAY 1 supercomputer shipped to Los Alamos Labs, NM | |
| US Voyager I photo reveals Jupiter's rings | |
By Scott Labrecque version 9.4.0.0