世界时(Universal Time,简称UT)是一种以格林威治子夜起算的平太阳时。世界时是以地球自转为基准得到的时间尺度,其精度受到地球自转不均匀变化和极移的影响,为了解决这种影响,1955年国际天文联合会定义了UT0、UT1和UT2三个系统:
它们之间的关系可以表示为:
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