During each of the six missions with successful lunar landings, one astronaut remained in lunar orbit while the other two landed. Six others remained in lunar orbit aboard their Apollo spacecraft command modules. The second human lunar landing mission, Apollo 12, launched from launch pad 39-A at Kennedy Space Center in Florida on November 14, 1969 via a Saturn Five launch vehicle. NASA landed six missions and 12 astronauts on the moon during the Apollo program. Besides the 12 people who have walked on the Moon, 12 more have flown to within 0.001 lunar distance of its surface. Apollo astronauts who flew to the Moon without landing. The Saturn V vehicle was developed by the Marshall Space Flight Center (MSFC) under the direction of Dr. Wernher von Braun. Apollo 12 The primary mission objectives of the second crewed lunar landing included an extensive series of lunar exploration tasks by the lunar module, or LM, crew, as well as the deployment of the Apollo Lunar Surface Experiments Package, or ALSEP, which was to be left on the moon's surface to gather seismic, scientific and engineering data.