 The last major event before Lunar Orbit Insertion ( LOI ) was a second mid @-@ course correction . It was in retrograde ( against direction of travel ) and slowed the spacecraft down by 2 @.@ 0 ft / s ( 0 @.@ 61 m / s ) , effectively lowering the closest distance that the spacecraft would pass the moon . At exactly 61 hours after launch , about 24 @,@ 200 miles ( 38 @,@ 900 km ) from the Moon , the crew burned the RCS for 11 seconds . They would now pass 71 @.@ 7 miles ( 115 @.@ 4 km ) from the lunar surface . 
