Gemini 8 (officially Gemini VIII) was a 1966 manned spaceflight in NASA's Gemini program. The mission conducted the first docking of two spacecraft in orbit. It was the 6th manned Gemini flight, the 12th manned American flight and the 22nd spaceflight of all time (including X-15 flights over 100 km).
The flight of Neil Armstrong marks the first time a civilian flew into space; all previous astronauts had been members of the United States or Soviet Armed Forces at the time of spaceflight. Armstrong had retired from the United States Navy in 1960.
Launch date: March 16, 1966, 16:41:02 UTC
Landing: March 17, 1966, 03:22:28 UTC
Measured 3 inches (7.62 cm) across.