Yesterday is just a term given by people to describe events which happened in the "past". Since the terms 'past', 'present', and 'future' are all subjective (one would argue that there is no present, as the moment they do mention the present, it becomes the past, like in Space Balls), and that time itself is aspatial and holds no actual scientific data to suggest such a thing exists in a material world, "where has yesterday gone" is a question best left to psychology professors and conspiracy theorists.
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