William, who says last night's alumni event at Nationals Park was the first baseball game he ever attended, was tipped off about the visible moon by Brad Bower, director of sports information.
"Anytime I see a moon over stuff, I kind of think of the Ansel Adams photo Moonrise, Hernandez, New Mexico," says William. "There's a legend that he made the exposure, because he knew exactly the candlepower of the moon. I didn't. I just took the picture."