Finding the time …

… Solved: A Decades-Old Ansel Adams Mystery - Atlas Obscura. (hat tip, Rus Bowden.)

… as Olson’s team has found previously, the sky itself is a peerless record. In the past, the team had used the moon’s shape and position to figure out exactly when and where another famous Adams photo, Autumn Moon, was taken. While Denali and Wonder Lake lacks any celestial objects to hang an investigation on, Moon and Denali, below, features a waxing gibbous moon glowing through the clouds.