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In this undated handout photo provided by the Scott Gediman of the Yosemite National Park Service, the firefall from Glacier Point is shown in Yosemite. 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. (AP Handout Photo/Yosemite National Park Service, Bethany Gediman) MUST CREDIT NATIONAL PARK SERVICE

Yosemite's 'lava waterfall'

January 1, 1970

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.