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Curiosity's Marsdial tracking time, sols 914-917 From sols 914 to 917, Curiosity was unable to move while engineers worked on a problem within the rover's drill. But she could use her mast-mounted instruments, and took advantage of the time to perform some calibration of the Mastcams. The activity involved doing Mastcam imaging at many different times of day. Nine different photos of the Mastcam calibration target show the march of time in the Marsdial gnomon's shadow. NASA / JPL / MSSS / Emily Lakdawalla