IERS Rapid Service/Prediction Center (c. 1986). Historic Delta T and LOD (页面存档备份,存于互联网档案馆). Source attributed data to McCarthy and Babcock (1986) . Retrieved December 2009.
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IERS Rapid Service/Prediction Center (c. 1986). Historic Delta T and LOD (页面存档备份,存于互联网档案馆). Source attributed data to McCarthy and Babcock (1986) . Retrieved December 2009.