This star chart was used Fred Haise and James Lovell while training in the Lunar Module simulator. The objective was to use this chart within two hours before lift off from the lunar surface to accurately align the LM computer’s navigational equipment relative to their landing point. This was important to do because the LM’s gyroscopic guidance equipment lost precision over time. The method involved looking through the LM’s Alignment Optical Telescope (AOT) and recording the coordinates of stars visible within the six circular overlays. Those circular areas on the chart overlay showed the AOT's field of view when moved to one of the six fixed positions known as detents. The star coordinates would be used with the LM guidance computer’s Program 57 (P57) to complete the platform alignment. This would insure that their flight to rendezvous with the lunar orbiting Command/Service Module would be as accurate as possible.
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