20070128

Autumn Moon

"'Autumn Moon, the High Sierra from Glacier Point,' taken by Ansel Adams in Yosemite National Park, is a thrilling view of the American West, featuring a waxing Moon rising over dark, ice-tinged peaks.

"Ansel Adams was always precise about exposure times and lens settings, but sometimes vague about when and where he took his pictures. Autumn Moon has been dated as both 1944 and 1948.

"Using lunar tables, topographic maps, weather records and astronomical software, backed by a scouting trip to Glacier Point itself, the researchers believe that Adams pressed the shutter on September 15, 1948 at 7:03 p.m. Pacific Daylight Time.

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