While reading the NASA overview of Apollo 11, says:
Apollo 11 launched from Cape Kennedy on July 16, 1969, carrying Commander Neil Armstrong, Command Module Pilot Michael Collins and Lunar Module Pilot Edwin "Buzz" Aldrin into an initial Earth-orbit of 114 by 116 miles.
What does "114 by 116 miles" mean? Is this listing the semi-major and semi-minor axes? What are the two numbers supposed to be referring to?