thumb|left|Aldrin walks on the surface of the Moon during Apollo 11. Photograph by Neil Armstrong, who can be seen reflected in Aldrin's visor.|alt=Aldrin stands on the Moon. Armstrong and the Lunar Module Eagle are reflected in his visor.thumb|Aldrin calls out speeds in feet per second and distances in feet as Armstrong pilots Eagle to its lunar landing, establishing Tranquility Base, July 20, 1969.thumb|left|Aldrin's first words after he set foot on the Moon On July 19 at 17:21:50 UTC, Apollo11 passed behind the Moon and fired its service propulsion engine to enter lunar orbit. In the thirty orbits that followed, the crew saw passing views of their landing site in the southern Sea of Tranquillity about southwest of the crater Sabine D. At 12:52:00 UTC on July 20, Aldrin and Armstrong entered Eagle, and began the final preparations for lunar descent. At 17:44:00 Eagle separated from the Columbia. Collins, alone aboard Columbia, inspected Eagle as it pirouetted before him to ensure the craft was not damaged and that the landing gear had correctly deployed.
tHuMb|lEFt|aLdrIn WaLkS on The SurfACe of the moon duRiNg ApoLlo 11. phOToGraph bY neiL ARmsTRong, who can be sEEn reflected In aldrIn's VisOr.|alt=aldRIn stANds on tHE moon. ARmsTroNg And tHe lunaR mOduLe eaGlE ARe reflEcTEd in his visor.ThUmb|aldRin callS OuT speeds in feEt peR sEcONd And disTANCeS IN fEet as armsTROng piloTs eaGLe TO iTs luNaR laNdIng, estabLIshINg trAnQUiLItY baSe, JULY 20, 1969.ThUMB|lefT|alDRin's fIrst wordS after hE set foot On The moon oN julY 19 aT 17:2150 utc, apOllo11 PasSed beHinD the MoOn aNd fIred its sErvice pROPulsIoN engine to enter lunar orbit. In The thIrtY OrbIts thaT followed, tHe crew saW paSsING ViEws of their laNding site iN thE soUtHErn SEA of traNquiLLity About SoUthweSt OF the crater sabIne D. At 12:52:00 UtC on july 20, aldrIn anD arMstrOng EnTerED eaglE, AnD bEgaN thE fInal pReparaTions for lunAr Descent. AT 17:44:00 eagle SeparAted frOm tHe ColumBIa. cOlLins, aLone aBoard cOlUMBia, inspecteD EaGlE as It pIrOuetted BefOre hIm to eNSuRE thE cRaft WAs Not DAmageD aNd That The LAnding geAR HaD correctly dePLoyEd.