From 10/11/1968 (Apollo 7 launches into Earth orbit) to 2/3/1984 (STS-41-B) is: 5593 days
5593 / 2 = 2796 days
From 10/11/1968 (Apollo 7 launches into Earth orbit) to 6/7/1976 is: 2796 days
http://en.wikipedia.org/wiki/STS-41-B
Launch: February 3, 1984
Landing: February 11, 1984
STS-41-B was the tenth Space Shuttle mission and the fourth flight for Challenger.
A highlight of the mission took place on the first day when astronauts McCandless and Stewart performed the first untethered space walk operating the Manned Maneuvering Unit (MMU) for the first time. McCandless -- the first human Earth-orbiting satellite -- ventured out 320 feet from the orbiter, while Stewart tested the "work station" foot restraint at the end of the Remote Manipulator System.
http://en.wikipedia.org/wiki/Apollo_7
Launch: October 11, 1968
Landing: October 22, 1968
Apollo 7 was the first manned mission in the Apollo program to be launched.
From 6/8/1937 (Bruce McCandless II) to 3/3/1959 is: 7938 days
From 7/16/1963 to 6/7/1976 is: 4710 days
4710 / 7938 = 0.5933
'59-33'
http://en.wikipedia.org/wiki/Bruce_McCandless_II
Captain Bruce McCandless II (born June 8, 1937 in Boston, Massachusetts) is a former naval aviator with the United States Navy and NASA astronaut. In the first of his two space shuttle missions he made the first untethered, free flight using the Manned Maneuvering Unit
http://en.wikipedia.org/wiki/Image:Astronaut-EVA.jpg
This now-famous image shows McCandless using the MMU which he helped develop; he was also the first to test it on STS-41-B in 1984
From 8/13/1942 (Robert Lee Stewart) to 11/26/1976 is 13 days, 3 months, 34 years
'1-33-34'
http://en.wikipedia.org/wiki/Robert_L._Stewart
Born August 13, 1942
Missions STS-41-B, STS-51-J
Robert Lee Stewart is a retired Brigadier General of the United States Army and former NASA astronaut.
STS-41-B Challenger (February 3-11, 1984) was launched from Kennedy Space Center, Florida, and returned to land there 8-days later. During the mission, Stewart and McCandless participated in two extravehicular activities (EVA's) to conduct first flight evaluations of the Manned Maneuvering Units (MMU's). These EVA's represented man's first untethered operations from a spacecraft in flight.
