New grindings, new findings? (1) - Sol 858

Caption NASA originale:"Since arriving at the Rover's current location on the 807th Sol of exploration (such as April 10, 2006), Spirit's knowledge of its attitude relative to the Sun has drifted. The Rover uses an onboard computer to keep track of attitude changes, but error builds up in this measurement over time. On Sol 855 (such as May 30, 2006), the Rover planners transmitted an attitude update of 1,97° to correct for the drift. After the update, Spirit re-acquired images from the same location to allow the Science Team to accurately target future observations.

Meanwhile, Spirit continued acquisition of the "McMurdo panorama" and removed another 2 mm of soil as part of a layer-by-layer soil study".