But don't you agree that the determinacy of the future is distinct from the determinacy of the past, being grounded or justified in a different way? — Metaphysician Undercover
In the context of your full reply, its almost a trick question for me: yes when addressed epistemologically, but no when addressed ontologically - ontologically they're two different facets of the same overall process.
Whereas we’ve previously mostly addressed past and future epistemologically, we’re now starting to mainly address them ontologically. By analogy:
If we are to address the present epistemologically, the present is that portion of time in which we (in part) hold direct awareness of everything that is not past and future. I’ve bracketed “in part” because, on one hand, the present is also where we intend things (with intentions always extending toward the future) as well as – hopefully not making this overly complex – being a time-span during which we are also aware of the past (memories) and the future (expectations). Still, when I’m aware of a bird chirp in the present, for example, this awareness pertains to neither the past nor the future.
But once we address the present ontologically, our views should take into account and thereby encompass all individual, intra-personal, experiences of the present. Many views can be found in relation to the issue of an objective present. My own – again, very difficult to justify in a forum setting – is that the objective present is a non-deterministic version of the theory of relativity’s notion of the present: the objective present, to my understanding (here summarized), consists of pockets of causal interactions between individual observers (or agents). For example, when two or more people interact, they will ontically share the same present moment; when there is no interaction between persons, there then is no guarantee that their two or more intra-personal present moments will be synchronized. (But a) this is a mouthful and b) again, other perspectives on the ontology of the present moment can also be found.)
The jump from the epistemological to the ontological consideration of the present requires different approaches. So too with the jump from the epistemological to the ontological consideration of the past and future. I'll try to explain myself better below.
And since things are caused to change, determinacy of the future is made complex by the need to understand causation.
Both forms of determinacy are complicated, but they are made complicated by different elements. So we cannot make one determinacy-indeterminacy spectrum, we would need two, one relating to the past and one to the future. — Metaphysician Undercover
Given what we've so far discusses and in large part agreed upon, we could argue that the objective past - though stored in memories (both unconscious and consciously recalled) - is solidified (another way of saying fixed or determinate). Whether or not our experiences of the present are, for example, hallucinations also gets solidified by their noncontradictory accord to our past.* As to the future, I can only address this via my own philosophical understandings; these include a determinate, Aristotelian telos which entails certain natural laws (such as that of gravity, for one example - notice how gravity can be extrapolated to be a noncontradictory coherency between gives that produces mass to which other gives are attracted ... long story though). Epistemologically, yes, we know gravity will continue to occur due to an upheld causal continuity between past and future. But, for me at least, ontologically, gravity is as determinate a property of existence as is this Aristotelian telos. Any hypothetical personal experiences of gravity not being as it always was can only be discovered in the future to have been hallucinations. At the same time, and with the same aforementioned determinate givens, I do subscribe to a limited freedom to choose between alternative means toward goals. Keeping this as simple as I currently can: This ontological interplay between determinate, time-invariant aspects of being (which thereby persist throughout the future) and
partly indeterminate decisions on the part of agents in the present, is then one facet of a reality wherein there is a mixture of interacting indeterminacy and determinacy (of chaos and order).
While I did state "stratifications" in the plural, when it comes to ontological appraisals, I also find that the determinacy of the past and of the future are two different facets of the same overall ontological process. But I get that this is imposing my own worldview into this discussions in manners that I cannot properly justify on a forum platform. Still, to provide an example of the way I think of things in relation to the past and the future:
* You see an oasis in the dessert; at this moment, your drinking of water in a little while (the future) is plausible because the present experience currently isn't contradicotry to the past. But once you arrive there and there is only sand, you now know that the experience of the oasis was only a mirage - because this conclusion is now the only one that is not contradicotory to the entirety of your solidified past. To this logic is implicit a desire to avoid the dolor of chaos that comes with extreme unpredictability. This impetus in us is not something we have a freedom to choose but is rather a predeterminate facet of our being - one that, roughly speaking, predetermines and also facilitates our capacity to choose goals and alternatives toward them - those that to us seem to optimally minimize our overall future dolor (in a mixture of both short- and long-term appraisals). Due to this determinate facet of our being, we will generally not freely choose to believe (although we could when metaphysically appraised) that a physical oasis was there but then it progressively vanished physically as we approached it. This would shatter the solidity of our past and, along with it, of our present - as well as most, if not all, our expectations of what will be in the future. And this would be exceedingly unpleasant. So, instead, we typically choose to appraise the oasis as a mirage.
Hope that example made some sense (I can easily see how it wouldn't to some/many). To try to recap, our past is solidified, determinate, fixed, though only composed of memories, for reasons aforementioned. Our future is, at least to me, a mixture of determinate and indeterminate states of affairs - in which we seek to obtain, or actualize, goals via a limited freedom of choice but, importantly for me, due to a fully determinate innate impetus to minimize overall dolor that (to me) is part and parcel of all sentient beings. And it is due to this same impetus (that is always conjoined with the future) that our past is as determinate as it is.
Now, I get that I've said a lot, and that a lot of it might be confusing, so I'll stop short and wait to see how the cookie crumbles. Short on time so I posted. I'll try to regroup if I need to.