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You can't have one without the other. Hmm that seems to need a musical accompaniment.

If you draw a graph on a piece of paper showing a mathematical function likey = x2 then it will show how y changes for different values of x; you get a parabola. Because of the way we 'experience' it, it is not difficult to appreciate that relationship for what it is. You can see what value of y will be produced for any value of x, you care to choose. (Or vice versa). You can see the whole picture.If you were only allowed to view the graph through a vertical slot which was moving horizontally across the page, you would only see one value of y at a time. You'd have to use your memory to recall the past values you'd seen and, unless you'd sussed out it was a parabola, each new value would be a wonderful surprise.To my mind, it could be a bit like that with things that vary with time. Our experience only allows us to appreciate things 'as they develop in time' but it's possible to remember the bits whic our moving time slot has passed over and it's often possible to predict what we will observe in the future, when we have identified a pattern.

If you draw a graph on a piece of paper showing a mathematical function like y = x^{2} then it will show how y changes for different values of x; you get a parabola. Because of the way we 'experience' it, it is not difficult to appreciate that relationship for what it is. You can see what value of y will be produced for any value of x, you care to choose. (Or vice versa). You can see the whole picture. If you were only allowed to view the graph through a vertical slot which was moving horizontally across the page, you would only see one value of y at a time. You'd have to use your memory to recall the past values you'd seen and, unless you'd sussed out it was a parabola, each new value would be a wonderful surprise. To my mind, it could be a bit like that with things that vary with time. Our experience only allows us to appreciate things 'as they develop in time' but it's possible to remember the bits whic our moving time slot has passed over and it's often possible to predict what we will observe in the future, when we have identified a pattern.If we could step outside of our particular set of observed dimensions, we could see events from beginning to end and, in any order - just like when we see the xy graph we drew - only with t on the horizontal axis.

How long is 'now'? That's the width of the slot.It should be no more of a problem to discuss instants of time than intantaneous position of a moving object.