On 13 Feb 2004 01:21:43 GMT, Nyal Williams
wrote:

Imagine an airport with diverging runways coming to
an apex and an aircraft on approach to one of them
with a wing low and in a slip. There is no wayto tell
whether it is a forward slip or a side slip unless
you know the intended runway.

This is true only if you take a snapshot of the situation. By
watching the ground track, you could determine the intended
runway.

-Pat