Each time-system thus possesses an aggregate of moments belonging to it alone.

Each event-particle lies in one and only one moment of a given time-system.

An event-particle has three characters[12]: (i) its extrinsic character which is its character as a definite route of convergence among events, (ii) its intrinsic character which is the peculiar quality of nature in its neighbourhood, namely, the character of the physical field in the neighbourhood, and (iii) its position.
[12] Cf.pp.82 et seq.
The position of an event-particle arises from the aggregate of moments (no two of the same family) in which it lies.

We fix our attention on one of these moments which is approximated to by the short duration of our immediate experience, and we express position as the position in this moment.

But the event-particle receives its position in moment M in virtue of the whole aggregate of other moments M{'}, M{''}, etc., in which it also lies.