Moon, Sun and Yosemite Align for Photo: forget carbon dating, even though i guess that doesn't really apply... but who cares? Astronomers at Texas State University have pinned down the exact time and date Ansel Adams snapped the famous "Autumn Moon." I'm a little late to this news, but it's so cool I had to blogit. They concluded that the picture was taken at 7:03 pm on Sept. 15, 1948 -- the scene captured at Glacier Point in Yosemite repeats itself every 19 years.