They carried a commercial cesium clock back and forth from the National Astronomical Observatory of Japan in Mitaka, at 58 m (190 ft) above sea level, to Norikura corona station, at 2,876 m (9,436 ft) above sea level, corresponding to an altitude difference of 2,818 m (9,245 ft). During the times when the clock stayed at Mitaka, it was compared with another cesium clock. The measured change in rate was (29±1.5)×10−14, consistent with the result of 30.7×10−14 predicted by general relativity.[9]