Posted for "Alain NOIREAUX" <alainoireaux@club-internet.fr>:

 Scott,
 what a science!! Did you get all that from your brain or did you dive in
Encyclopedia Britannicus ?
 Alain NOIREAUX   F-PSDV

"""
...snip...
  When observing closing aircraft, there are only 2 distances that matter: No
problem and Yikes!
"""