LONDON - The moon darkened, reddened, and turned shades of gray and orange Saturday night during the first total lunar eclipse in nearly three years, thrilling stargazers and astronomers around the world. The Earth's shadow took over six hours to crawl across the moon's surface, eating it into a crescent shape before engulfing it completely in a spectacle at least partly visible on every continent. About a dozen amateur astronomers braved the cold and mud outside the Croydon Observatory in southeast London to watch the start of the eclipse. "It's starting to go!" said Alex Gikas, 8, a Cub Scout...