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Yep. That it is tracking south to north points directly to an internal reflection (within the camera or the dome housing) says reflection as its movements are the opposite to those of the movement of the sun across the sky, just as all internal reflection (flares and spots) move.
Easy way to do this is point your camera in the direction of the sun. As it is so bright flares, and even spots, will appear. As you move the camera the reflections move with or opposite to the relative movement of the sun, just depending on the way the reflections have been created.
Don't forget that the sun is very prominent in the pictures. Reflections would be inevitable.
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