By Robert Godwin
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Extra resources for Apollo 11 : the NASA mission reports
Excess time and fuel were expended during the first period because of difficulty in locating the substellar point of each star. Ground-supplied gimbal angles were used rather than those from the onboard computer. This technique was devised because computer solutions are unconstrained about the optics shaft axis; therefore, the computer is unable to predict if lunar module structure might block the line of sight to the star. The groundsupplied angles prevented lunar module structure from occulting the star, but were not accurate in locating the precise substellar point, as evidenced by the fact that the sextant reticle pattern was not parallel to the horizon.
By doing a deep knee bend, then springing up the ladder, the Commander was able to guide his feet to the third step. Movements in the i/6-g environment were slow enough to allow deliberate foot placement after the jump. The ladder was a bit slippery from the powdery surface material, but not dangerously so. As previously stated, mobility on the platform was adequate for developing alternate methods of transferring equipment from the surface. The hatch opened easily, and the ingress technique developed before flight was satisfactory.
The descent maneuver was initiated in a face-down attitude to permit the crew to make time marks on selected landmarks. A landing-point-designator sighting on the crater Maskelyne W was approximately 3 seconds early, confirming the suspected downrange error. A yaw maneuver to face-up attitude was initiated following the landmark sightings at an indicated altitude of about 45 900 feet. The maneuver took longer than expected because of an incorrect setting of a rate display switch. Landing radar lock-on occurred before the end of the yaw maneuver, with the spacecraft rotating at approximately 4 deg/sec.
Apollo 11 : the NASA mission reports by Robert Godwin