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Jason-1 was launched on 7 December 2001 from Vandenberg Air Force Base, in California, aboard a Delta II Launch vehicle. During the first months Jason-1 shared an almost identical orbit to TOPEX/Poseidon, which allowed for cross calibration. At the end of this period, the older satellite was moved to a new orbit midway between each Jason ground track. Jason had a repeat cycle of 10 days.