The 80-year-old Aaron was given a standing ovation in Tuesday's night ceremony. Aaron broke Ruth's record with his homer on April 8, 1974 off the Dodgers' Al Downing.
Downing attended the ceremony and threw out the first pitch. Some of Aaron's 1974 teammates returned, including Dusty Baker and Tom House, who caught the homer in the bullpen.
Aaron thanked fans "for all your kindness all these many years." Aaron, recovering from recent hip-replacement surgery, used a walker.
The Braves wore their 1970s era white-and-blue uniforms, complete with small "a'' caps, in tribute to Aaron.