Since relativity, we know time is attached locally to an observer.... But at Newton's time was in some sense global...(the same for every particle you describe). So what does that global time meant ( when compared to the meaning it has in the relativistic framework) ? It seems to me it's now inimaginable..some kind of universal clock...but this has no sense any more..(Like if the observer had two kind of time : a local and a kind of global one ???) Does somebody sees the same problem as me ?