All but perhaps some of the youngest members are aware of Ansel Adams's image, "Moonrise, Hernandez, New Mexico" and the story behind it. Google the image and its story. There are several accounts around how that image came to be, but here is the most accepted version in the words of Mr. Adams from his book "Examples: The Making of 40 Photographs:"

"I could not find my Weston exposure meter! The situation was desperate: the low sun was trailing the edge of clouds in the west, and shadow would soon dim the white crosses ... I suddenly realized that I knew the luminance of the Moon — 250 cd/ft2. Using the Exposure Formula, I placed this value on Zone VII ... Realizing as I released the shutter that I had an unusual photograph which deserved a duplicate negative, I quickly reversed the film holder, but as I pulled the darkslide, the sunlight passed from the white crosses; I was a few seconds too late! The lone negative suddenly became precious."

The intensity of sunlight on the full moon is the same as sunlight on earth at noon. So his words of explanation are essentially saying that he used the sunny 16 rule to capture this famous image.