Interesting. I often see the brighter stars and planets behaving 'erratically', particularly when high in the sky. Astonishing accelerations, sideways shifts etc. I've always assumed (correctly I think) that it is a form of vertigo, which I am prone to. Quite disconcerting when you see Jupiter speeding across the sky, then making a right-hand turn, LOL!
It springs to mind whenever I hear people describing the behaviour of strange bright lights in the sky.
Cheers -
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