| Date | Weekday | Event | ||
|---|---|---|---|---|
| April 1, 1778 | Wednesday | Oliver Pollock - a New Orleans Businessman - creates the "$". | ||
| April 1, 1850 | Monday | San Francisco County Government established. | ||
| April 1, 1941 | Tuesday | Navy takes over Treasure Island. | ||
| April 1, 1960 | Friday | TIROS I (Television & Infra-Red Observation Satellite) launched to improve weather prediction. | ||