Fifth Seal
1: The first manned Apollo flight was delayed by a tragic accident, a fire that broke out in the spacecraft during a launch rehearsal, killing three astronauts.
2: (On Oct. 11, 1968), following several unmanned Earth-orbit flights, Apollo 7 made a 163-orbit flight carrying a full crew of three astronauts.
3: Apollo 8 flight (Dec. 21-27, 1968), Apollo 8 carried out the first step of manned lunar exploration; from Earth orbit it was injected into a lunar trajectory, completed lunar orbit, and returned safely to Earth, in which the first manned voyage around the Moon was made. The astronauts, including Anders, Frank Borman, and James Lovell, remained in an orbit about 70 miles (112 km) above the surface of the Moon for about 20 hours, transmitting television pictures back to Earth and verifying that lunar landmarks could be used for navigation to lunar landing sites.
4: (launched March 3, 1969). Apollo 9 carried out a prolonged mission in Earth orbit to check out the Lunar Module.
5: (May 18, 1969Apollo 10) journeyed to lunar orbit and tested the LM to within 9 1/2 miles (15 kilometers) of the Moon's surface.  On May 18, 1969, Cernan, Stafford, and John W. Young began the eight-day mission of Apollo 10. As Lunar Module pilot, Cernan brought the landing craft into a close lunar orbit, approaching the surface to within 16 km (10 miles). Stafford and Cernan completed a complex series of orbital maneuvers before rejoining the Command Module. The mission performed every function necessary for a lunar landing but the landing itself and was the final test of Apollo systems.
6: Apollo 11, (in July 1969), climaxed the step-by-step procedure with a lunar landing; the astronaut Neil Armstrong became the first human to set foot on the Moon's surface.
7: Apollo 12 mission (Nov. 14-22, 1969), in which two long walks, totaling nearly eight hours, were made on the Moon's surface. Bean and Comdr. Charles Conrad, Jr., piloted the Lunar Module to a pinpoint landing on the Moon, while astronaut Richard F. Gordon, Jr., orbited overhead in the Command Module.
8: Apollo 13, launched in April 1970, suffered an accident caused by an explosion in an oxygen tank but returned safely to Earth.
9: Remaining Apollo missions carried out extensive exploration of the lunar surface, collecting large numbers of samples of Moon rocks and installing many instruments for scientific research, such as the solar wind experiment, and the seismographic measurements of the lunar surface.
10: Apollo 17, the final flight of the program, took place in December 1972.