Retarded time

Retarded time

According to Maxwell's Equations, electromagnetic waves in a vacuum travel at the speed of light, "c". Since "c" is finite, a photon emitted when "t = t0" takes a certain amount of time to reach an observer located at a distance "r" from the source, so that the observer only notices it when "t" = "t1":

:t_1 = t_0 + frac{r}{c}

This can be rearranged as:

: t_0 = t_1 - frac{r}{c}

The time t_0 = t_1 - frac{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.

A theory which borrows heavily from the concept of retarded time is the Noron theory, proposed by Professor Richard Hills of Cambridge University.

See also

*Jefimenko's equations
*Noron theory


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