Apollo 8 astronauts, from left to right, William Anders, James Lovell, and Frank Borman, are joined at the National Air and Space Museum by Mercury astronaut Senator John Glenn and Museum director John R. Dailey. The three astronauts were speakers at the annual John H. Glenn Lecture November 13, 2008, in commemoration of the 40th anniversary of the Apollo 8 mission that took place from December 21-27, 1968.