Starting count - at 0 or 1?

[bob jenkins]

Originally Posted by bucky

I have to respectfully disagree with the answer to the first question and it looks as if you are saying yes by your sentence "The arm swing ends at one second." Clearly time elapses from 0 to one second at which time there would be no visual indication of a count.

There's the start of the swing and the motion of the arm. The same thing that happens between 1 and 2 (etc.). No one is complaining "hey -- you stopped your count" during that interval