  In a recent paper, we have a shown that the flattening of galactic rotation
curves can be explained by retardation. However, this will rely on a temporal
change of galactic mass. In our previous work, we kept only second order terms
of the retardation time in our analysis, while higher terms in the Taylor
expansion where not considered. Here we consider analysis to all orders and
show that a second order analysis will indeed suffice, and higher order terms
can be neglected.
