Retarded time
Propagation delay of EM radiation (light) / From Wikipedia, the free encyclopedia
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Not to be confused with Retardation time.
In electromagnetism, electromagnetic waves in vacuum travel at the speed of light c, according to Maxwell's Equations. The retarded time is the time when the field began to propagate from the point where it was emitted to an observer. The term "retarded" is used in this context (and the literature) in the sense of propagation delays.