A bright target sits over gray sea
Department of War, CENTCOM, 2020.
The object drifting in and out of clouds gives the viewer a natural reference. Clouds also create ambiguity about distance and size. This is one of the better examples of why context helps and still does not solve the case.
From the file
Visual note: Aerial sensor footage of a small dark spherical object against a broken cloud deck, drifting in and out of clouds, presented in an annotated/enhanced format with a 'Original Video' panel.