I was thinking of things being more stationary I guess. A person standing still waving his hand side to side has no forward motion, so no real distance covered, just time
Motion is probably not the right word, maybe perception. I was thinking one day about the speed of things and came upon a question I couldn't answer. So you have two people on either side of a valley, person #1 claps their hands. That sound reaches person #2 in X amount of time. Person #1 then...