TDB（质心力学时）
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<timefyi-glossary slug="tdb"></timefyi-glossary>定义
用于行星星历表的相对论时间尺度，在太阳系质心处测量，考虑了地球与太阳距离变化带来的相对论效应，与地球时（TT）之差不超过2毫秒。