DM wrote:


yes, I've imagined the whole trig thing. That's why I was looking at the
buildings and other higher geographic markers to get a fix on how it
appeared to be moving relative to those things. Plus, for a moment I was
stopped and pretty much next to it, although of course I was on the
ground and it was probably a couple of thousand feet up or less. And, if
it makes a difference in possible explanations, the plane was headed
east and I was moving west. I'm 99.999% sure it wasn't moving or was
moving very slowly.

Put me in for $100 on that 99,999-to-1 odds bet! g

Seriously, it sounds like you are trying to understand what you
perceived, and I think the responses here have been right on target.
I'm betting on the laws of physics and hope some explanation here will
lead to an "aha" for you, to understand what caused your perception.
--
Alex -- Replace "nospam" with "mail" to reply by email. Checked infrequently.