Time on other planets

This assumes that the speed of light is a constant.

IANAastrogator but if planet A and planet B are in motion, possibly away from each other depending on point in orbital period, chasing down a destination moving away from you in a short distance would be considered impressive.
Its akin to saying my friend left for New York an hour before me and I caught up to him after 60 miles, pronunced I was going at least 60 mph faster than him.