It looks like you might be asking about a sunset UFO photo - here are some great ones from the search!
The Calvine UFO Incident (1990, Scotland) is often cited as the world's best ever real UFO photograph - it shows a large diamond-shaped craft over hills. The original photos were held secret by the British Ministry of Defence for decades before being released.
Also worth noting: lenticular clouds at sunset are notorious for looking convincingly like UFOs - they form in wave patterns around mountains and have a classic saucer shape.
Were you looking for something specific? For example:
Real/famous UFO photos (like the Calvine incident)
Artistic/conceptual sunset UFO images
Something else entirely? (Did you mean "up" photo, like a close-up shot of a sunset?)
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