On this date every year, swallows traditionally return to the San Juan Capistrano Mission in CA. 1858: Britain's first planetarium, the London Planetarium, opened. 1886: Aircraft manufacturer Giuseppe Bellanca (Citabria, Decathlon, Viking) was born. 1918: Congress approved daylight-saving time (DST). 1932: The Sydney Harbour Bridge in Australia opened for traffic. 1933: The Civilian Conservation Corps was created. 1987: French physicist Louis de Broglie, known for his research on quantum theory and for his discovery of the wave nature of electrons, died. 1989: Boeing B-22 Osprey VTOL aircraft made its maiden flight. 1991: Patent #5,000,000 was issued. 2001: CA officials declared a power alert, ordering the first of two days of rolling blackouts. 2007: A partial solar eclipse is lined up for Asia. 2008: Sci-Fi write Arthur C. Clark (2001 Space Odyssey) died.