What are the scientific and technological achievements of American Gemini spacecraft?

First of all, it provides enough long-term flight experience for the implementation of the Apollo program, including physiology, medicine, life and so on.

Secondly, the reliability and life of long-term operation of temperature, oxygen supply and pressure of spacecraft under manned conditions are verified.

Thirdly, the most important rendezvous and docking of aircraft has been completed, which provides strong evidence for the lunar orbit docking scheme of manned landing on the moon.

Fourth, more than two hours of extravehicular activities were completed, which accumulated experience for astronauts in lunar activities.

Fifth, the attitude control, maneuver and orbit change flight of the aircraft are realized. This is the basic task of the Apollo program.

Sixth, the controlled reentry was realized, which improved the landing accuracy and provided greater guarantee for the safety of astronauts.

Seventh, the spacecraft is divided into several sections, and only the manned cabin is recovered when re-entering. Apollo spacecraft also adopted this model.

Eighth, the new fuel cell of Gemini spacecraft has been verified and improved, and successfully used in Apollo spacecraft.

Ninth, some problems existing in Gemini spacecraft, such as the reliability of attitude control system, the failure of life-saving system, the heaviness of spacesuit and the difficulty of spacewalking, have been widely absorbed and improved by Apollo program.

Tenth, the Gemini program also provides astronaut training and experience in space life. In addition, Gemini's flight provided direct guidance for the determination of Apollo mission.

Eleventh, long-distance communication with the ground has been developed and verified.

Twelfth, the work of each console station on the ground meets the requirements of long-distance space flight. In addition, the plan has made a lot of achievements in earth observation and scientific experiments.