Sigma 7

by Robert Godwin

ISBN: 9781894959018

Published: 2003

At 7:15 a.m. on October 3, 1962, Project Mercury Astronaut Walter M. Schirra, Jr., in his Sigma 7 spacecraft, was launched into space and orbited the Earth six times, completing another step in the grand U.S. program to send a man to the Moon and then return him safely to Earth. Because of the brief durations of the previous Mercury flights, the astronauts spent the majority of their flight time in getting to orbit and preparing to leave orbit. Schirra's six-orbit mission lasted more than nine hours, which for the first time allowed an astronaut to experience an extended period of weightlessness. In addition, the time available allowed Schirra to engage in orbital manoeuvring, exercising the various manual and automatic control modes, and to spend time on photography and scientific experiments. After his return to the United States, Schirra described his Sigma 7 mission as "a text book flight." A compilation of inputs from engineering, operations and medical personnel had been...