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Light-time correction
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==Calculation== A calculation of light-time correction usually involves an [[iteration|iterative]] process. An approximate light-time is calculated by dividing the object's geometric distance from [[Earth]] by the speed of light. Then the object's velocity is multiplied by this approximate light-time to determine its approximate displacement through space during that time. Its previous position is used to calculate a more precise light-time. This process is repeated as necessary. For planetary motions, a few (3β5) iterations are sufficient to match the accuracy of the underlying [[Ephemeris|ephemerides]].
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