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b) there is no fixed point in space, ergo, no fixed point in space time
i appreciate that. however, i do believe that if we accept space and time as one and not two factors, then each 'moment' can be defined by co-ordinates of its point in space and time, and perhaps velocity and direction in time. my confusion comes from the conflicting idea, at least conflicting to me, that space is not fixed and is expanding; this is why it is believed there is no 'centre' of the universe - it expands constantly and would have to constantly move to adjust.so, surely any co-ordinates must be incorrect?