Project Gemini

Project Gemini was the second human spaceflight program in which the United States of America sent humans into space, between Projects Mercury and Apollo, during the years 1963-1966. Its objective was to develop techniques for advanced space travel, notably those necessary for Apollo, whose objective was to land men on the Moon. Gemini missions involved extravehicular activity and orbital maneuvers including rendezvous and docking.

Further reading:

• Gene Kranz, Failure is Not an Option. Factual, from the standpoint of a chief flight controller during the Mercury, Gemini, and Apollo space programs. ISBN 0743200799
• David M. Harland, How NASA Learned to Fly in Space: An Exciting Account of the Gemini Missions, Apogee Books, 2004, ISBN 1894959078
• David J. Shayler, Gemini, Springer-Verlag Telos, 2001, ISBN 1852334053
• On the Shoulders of Titans: A History of Project Gemini - NASA report (PDF format)
• Project Gemini technology and operations - A chronology - NASA report (PDF fomat)