On presentism, the present alone exists, and not in the trivial sense that the present alone exists at present, but in the substantive sense that the present alone exists simpliciter. But if so, then the past is nothing, a realm of sheer nonbeing. But surely the past is not nothing: it happened, and is in some sense 'there' to be investigated by historians and archeologists and paleontologists.
If our presentist cannot accommodate the reality of the past, then his position is hopeless. He might say this: the past is real, but its reality is wholly contained in the present. The causal traces of past events in the present constitutes the entire reality of the past. Will this work? No. There simply aren't enough causal traces!
On the principle of bivalence, every proposition is either true, or if not true, then false. Given that bivalence holds for what presently exists, it is difficult to see how it could fail to hold for what did exist. Why should the present, which is wholly determinate, become less than wholly determinate when it becomes past? However things stand with the future, one reasonably views the past as a realm of reality and thus as wholly determinate.
Our knowledge of the past is spotty, but not the past itself. It was, and I would add: it actually was. When a thing passes away it does not pass from actuality to mere possibility; it remains actual, though no longer temporally present. Or so it would seem if we are realists about the past. The historian studies past actualities, not past possibilities.
Compare Kierkegaard's engagement to Regine Olsen to his marriage to her. There is a loose sense in which both events belong to the past. It is clear that he was engaged to Olsen. We also know that he did not marry her. But he might have. This possible event belongs to the past in the sense that, had it been actual, it would have belonged to the actual past. The crucial difference is that the first event actually occurred while the second was a mere possibility. This is a difference that an adequate philosophy of time must be able to accommodate.
To make a slogan out of it: the past is fact, not fiction; actuality not possibility.
One point to keep in mind is that if the past is wholly determinate, as determinate as the present, this is the case whether or not determinism is true. The determinate is not to be confused with the determined. (Bourne 2006, 50 f.)
Consider the proposition that my grandfather Alfonso drank a glass of dago red on New Year's Day, 1940. Bivalence ensures that the proposition is either true or false but not both. If the proposition is true and the event occurred, it doesn't matter whether the event was caused by prior events under the aegis of the laws of nature, or not. To say that the past is determinate is not to say that past events are determined; it is to say that, e.g., the past individual Alfonso V. cannot be such that he neither drank nor did not drink red wine on the date in question. It had to be one or the other if bivalence holds for the past.
Of course, no one now remembers whether or not this event occurred, and there is no written record or other evidence of the event's having occurred. If the event occurred, nothing in the present points back to it as to its cause. Some past events, states, individuals, and property-instantiations leave causal traces in the present, but not all do. My grandfather's gravestone and the dessicated bones lying beneath it are causal traces in the present of a long-dead and wholly past individual. But there is nothing in the present that bears upon the truth of the proposition that Big Al drank a glass of vino rosso on New Year's Day, 1940, assuming it is true. If true, it is true now but lacks a present truth-maker.
So it looks as if our presentist is in a serious bind. The following cannot all be true:
1) Presentism is true: whatever exists at all, exists at present.
2) The past is real.
3) The past is determinate.
4) There are countless events that really happened that no one remembers and for which there is not a shred of evidence in the present.
It seems to me that the obvious solution to this aporetic tetrad is to deny (1).
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