Project Gemini was NASA’s second human spaceflight program, conducted between projects Mercury and Apollo. It started in 1961 and concluded in 1966. It was an enormous undertaking, involving awesome risks, and set the stage for the last and greatest adventure in the U.S. space program, Project Apollo. “Appointment in the Sky” is the story of the men and machines of Project Gemini as told by Sol Levine, the deputy technical director of the project. Published in 1963, in the midst of Project Gemini, Levine describes its origin and purpose, the special training of the pairs of astronauts who participated, and the minute-by-minute procedures of the flight, the rendezvous in orbit, the uncoupling and the re-entry. It is filled with detail about space flight. President Lyndon Johnson wrote the Foreword to the book.

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