
The Firefall Photograph from Glacier Point is shown in Yosemite National Park. A window of time just opened in Yosemite National Park when nature photographers wait, as if for an eclipse, until the moment when the sun and earth align to create a fleeting phenomenon. This marvel of celestial configuration happens in a flash at sunset in mid-February _ if the winter weather cooperates. On those days the setting sun illuminates one of the park's lesser-known waterfalls so precisely that it resembles molten lava as it flows over the sheer granite face of the imposing El Capitan. Merely, an optical illusion.

A youngster walks along the banks of the Merced River, in view of El Capitan (L), and Bridalveil Fall (R) in Yosemite National Park, California May 17, 2009.