Astronomy On This Day In History: Christiaan Huygens Discovers Saturn’s Largest Moon Titan – On Mar 25, 1655 MessageToEagle.com | March 25, 2016 MessageToEagle.com – On March 25, 1655, Christiaan Huygens, a Dutch amateur astronomer, discovered Saturn’s satellite Titan, named for its great size (half that of the Earth’s) and thought to Read More