2005/01/14 | 历书时[Ephemeris Time]
类别(¤〖天文〗) | 评论(1) | 阅读(55) | 发表于 12:40
A uniform time measure now kept by atomic clocks. Ephemeris Time (ET) was used in the Astronomical Almanac from 1960-1983, but was replaced by barycentric dynamical time when the IAU 1976 System of Astronomical Constants was implemented in the Astronomical Almanac in 1984.
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