Here are 5 interesting facts about January 15 in California history:

1. In 1919, the Grand Canyon of the Pacific, also known as Waimea Canyon, was designated as a state park. This natural wonder is located in Kauai, Hawaii, but its recognition as a state park on January 15 was significant for Californians who enjoy nearby Hawaiian destinations.

2. On January 15, 1939, the San Francisco Golden Gate International Exposition opened on Treasure Island. This was a world's fair event and attracted millions of visitors from around the globe over the course of two years.

3. In 1947, a trial against actor Errol Flynn began in Los Angeles. He was accused of statutory rape of two underage girls. The trial was a major event and received widespread media attention.

4. 1994 saw the Northridge earthquake, which happened on January 17, but the earthquake caused intense damage around Southern California, including the San Fernando Valley. The quake had a significant impact on the state and the wider region.

5. On January 15, 2009, the "Miracle on the Hudson" happened when US Airways Flight 1549, piloted by Captain Chesley "Sully" Sullenberger, landed safely in New York City's Hudson River after hitting a flock of geese. Many of the passengers were from California and the incident became a source of national pride and resilience.