First crewed spacecraft to change orbit

NASA's Gemini 3 marked a pivotal advancement in space exploration as the first crewed spacecraft to successfully change its orbit. This mission was part of the Gemini program, which aimed to develop the necessary technologies and techniques for future manned missions to the Moon. The Gemini spacecraft were designed to support a two-man crew and were equipped with advanced systems that allowed for orbital maneuvers. The ability to change orbits was crucial for the upcoming Apollo missions, which required precise navigation and control to reach lunar destinations. The successful execution of this maneuver demonstrated the capabilities of the spacecraft and the astronauts, paving the way for more complex missions in the future. The Gemini 3 mission not only showcased the technological advancements of the time but also contributed to the understanding of human factors in space travel, including the effects of microgravity on the human body and the psychological challenges faced by astronauts during extended missions.