<p>Using old-fashioned detective work and modern astronomical tools, researchers said they have solved one of the most intriguing mysteries in art history, the moment that Vincent van Gogh immortalized in his painting "Moonrise."</p>
<p>The Dutch artist created the masterpiece the night of July 13, 1889, while watching a nearly full moon rise over a hill exactly at 9:08 p.m. local time, according to astronomer Donald Olson and colleagues.</p>