So, the question for me is, can we really pin anything down as being now?
It seems that now is never a thing that can really be pinned down. Various things are constantly happening and don't all happen at the exact same time in perfectly spaced out intervals like the ticking of a clock.
Now seems to be more like a process, a fluid happening. If the future is only a potential that could be manifest in the now and the past just one what was once experienced in the now, there never has been an experience of anything but now. Though, physically, we experience things after they happen, we are experiencing them now, not later.
So, I don't think we can box now into a series of moments, how can you really quantify a moment? Now can't appropriately be considered a moment that passes and is then replaced by a new moment, each now; that would require now to be a measurable instance.
Now seems like more of an ongoing process, the only ongoing process that is ever going on. From that point of view, it seems that the past and future, as we normally define them, can only be inaccurate in describing the actual realities of them, IMO. If a person were to travel into the relative future of what is happening in the collective now, he would still be in the now, as far as he is concerned and what is our now, he would consider his past.
I don't think we can ever pin down now as any particular thing. It will just have to be a word to express the condition of experience. While the ideas of past and future are dependent on the idea of now to be valid, the idea of now does not necessarily depend on past and future to be valid, yet without them, I think the idea of now would take on a totally different meaning, though it would still be the only process of experience ever going on.
Perhaps everything is always happening right now and our location in it defines what we would consider to be the past or the future. That would make placement in time and space relative and ultimately without objective value, but only indicative of what objects an individual is experiencing as now.