Even if this horoscope was really published on the alleged date, it is, as already noted, vague enough to apply to any number of things. As a "prophecy" of Pearl Harbor, I don't think it's even that succesful in its vagueness:
quote: wholly inexplicable occurences
I don't see how that applies at all--the attack on Pearl Harbor was many things, but inexplicable? The motives for the attack are pretty well documented, and hardly fall into the realm of things that defy explanation--they were, in their way, quite rational.