Perseid crossing the trails at a slant

A clean diagonal streak cutting across a field of parallel star trails. The trails all run one way, set by the Earth's rotation over the length of the stack; the streak runs across them at a distinctly different angle, and is brighter and smoother along its length than any trail beside it.

Placeholder - the classification reasoning is still to be written. The non-sidereal angle is the point: everything fixed on the sky shares one direction in a trailed frame, so a track at a different angle did not come from a star. Both ends stop inside the frame. No timestamp on the crop, so no sun-altitude cross-check.