[TXnMA]

You cannot back light a contrail at 35,000 feet from a setting sun if you are observing close to sea level. It is physically impossible. "

You obviously have no grasp of the geometry of sunset. A contrail appearing to come from over the horizon near (in azimuth) to where the sun has recently set can only be backlighted.

Where do you think the sun is? Between the earth and the contrail?

Hint: the Earth is round...

Must I draw you a picture?

[Yardstick]

Must I draw you a picture?

Already dun it. See #48.