%0 Journal Article %T Causal Version of Newtonian Theory by Time¨CRetardation of the Gravitational Field Explains the Flyby Anomalies %A Hafele J. C. %J Progress in Physics %D 2013 %I HEXIS (Arizona) %X Classical Newtonian gravitational theory does not satisfy the causality principle because it is based on instantaneous action-at-a-distance. A causal version of Newtonian theory for a large rotating sphere is derived herein by time-retarding the distance between interior circulating point-mass sources and an exterior eld-point. The resulting causal theory explains exactly the six yby anomalies reported by Anderson et al. in 2008. It also explains exactly an anomalous decrease in the Moon¡¯s orbital speed. No other known theory has been shown to explain both the yby anomalies and the lunar orbit anomaly %K instantaneous action-at-a-distance %K large rotating sphere %K Moon¡¯s orbital speed %U http://www.ptep-online.com/index_files/2013/PP-33-01.PDF