If it has fully crossed the line and the ref or linesman judges it to be out
Up until just recently, it was judged as where the ball is. Now, if any part of the person throwing the ball, even just a foot, is behind the line of scrimmage, that is a legal pass.
It's judged by the fact the ball is either in or outside of the lines (court). if it's on the line it counts as in.
The tennis ball is on the line.
If the ball hits the line then the ball is called in. But if its even a little bit over the line then its out and the other team gets the ball.
In tennis, if the ball touches any part of the line, it is considered in. If the ball does not touch the line at all, it is considered out.
If the ball hits the line, it is considered in.
If the ball touches the line, it is considered in.
it is the out of bounce line, if the top of the ball hits the line, the ball is in
In tennis, if the ball touches any part of the line, it is considered in. If the ball does not touch any part of the line, it is considered out.
If a ball hits the foul line, it is a fair ball.
There is a computer game called Ball Line
If a volleyball hits the line in volleyball, the ball is considered to be in (any part of the ball).