Retarded time
= Retarded time
{title2=$t_{\rm ret}$}
{wiki}
For a source point $y(s)$ and field event $(x,t)$, the retarded time solves
$$
t_{\rm ret}+\frac{|x-y(t_{\rm ret})|}{c}=t.
$$
= Retarded time
{title2=$t_{\rm ret}$}
{wiki}
For a source point $y(s)$ and field event $(x,t)$, the retarded time solves
$$
t_{\rm ret}+\frac{|x-y(t_{\rm ret})|}{c}=t.
$$