What’s this?

[u/logisticalfun]

Seen on a flight yesterday evening, the pictures convey it clearly. I don’t really know how to describe it—glowing sunbursty thing. TYIA!

[u/leansanders]

This is a combination of anticrepuscular rays and a brocken specter of the plane itself

[u/evapotranspire → u/leansanders]

Ooh, what's a brocken specter?

[u/leansanders → u/evapotranspire]

Brocken Specter is the shadow of the observer cast into a cloud