Helm Roberts and his dog, Orion, visited the Kentucky Vietnam Veterans Memorial in Frankfort, which he designed, in 2008. Roberts used mathematics to figure out how to make the memorial’s sundial gnomon fall on each soldier’s name on the day he or she was killed in the war. Roberts died on his 80th birthday, Aug. 26, 2012. Photo by Tom Eblen | teblen@herald-leader.com

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