@sysconfig
In the same vein of sarcasm I thank you for your comment.
That sounds like you are done and everyone can move along now nothing to see anymore..thanks for your help
But it should be pointed out to you that the above exchange was needed in order for everyone to "move on" with the same point of reference.
Up until this discussion, there had been no way for any but the most diligent and up to date sat engineer types to know the location of the plane at 18:28, because of a mistake that had been made early on. If you will read sk999's post on the previous page you will learn that Duncan Steel's Ping Ring radii are wrong, as is, Richard Cole's BTO model, and I dare say that without the above conversation mm43's graphic on this page would have carried forth the same error.
I'm glad to see that you made it as far as two posts, but it seems that it's time for you to get a new handle (probably once again.)