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Tom
Why is "this going nowhere" and what I write "strong opinions"?
Having properly ignored all metaphysical possibilities, there is something which is physically existent, it re-occurs. It is a sequence. That's it.
Sensory systems have evolved to take advantage of certain components of this something, which enables the identification of difference with the comparison of occurrences, and the order of occurrences. By definition, theses sensory systems are independent of physical existence, they just enable the possessor thereof to have a representational awareness of it.
I fail to understand where the "opinion" or the "naive realism" is in this, as a generic statement about what is, and how it is not foundational to physics, since that is supposed to be objective knowledge about what is. Starting on any other basis is doomed to failure, because that is how physical reality occurs (in simple language).
"what kind of sequence?" A sequence of physical existence, which is what I said, and you quoted, before then asserting it was a "nonsensical statement", and then asking this question. A sequence is an order, that is the definition of it. Obviously it is not "duration", that is a feature of the sequence as such, ie the rate at which difference occurs irrespective of the characteristic of the change. As I said, by definition, because it is all sequence, its "members" can be anything you wish to define ("A sequence could be anything, the entirety of reality, you, the moon, St Paul's cathedral, an elementary particle").
"what is the origin and how does one know?"
By definition, we cannot know. As I said above "having properly ignored all metaphysical possibilities". We can only scientifically investigate physical reality as manifest to us (much of which is not directly manifest because of practical problems in the sensory detection process, not metaphysical concerns), not what it might be on the basis of some belief.
Paul