Maxwell's theory of electromagnetism admits two kinds of mathematical solutions for equations describing energy in an electromagnetic field. According to these equations, electromagnetic waves in a vacuum travel at the speed of light. Since the speed of light is finite, there must be a delay between the moment the photon is emitted at t = t0, until the observer at distance r notices it at t = t1:
t1 = t0 + r / c
The equation can be rearranged to:
t0 = t1 - r / c
The time (t0 = t1 - r / c) is defined as the retarded time and represents the delay between the photon emission and the moment at which it reaches the observer. It is the (BIG T) Time reverse solution.
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