Predicting Away

Thought Viper posed an interesting question in the post from Sept 1, 2003, inspired by the Telegraph article "Astrologers fail to predict proof they are wrong." Excerpt:

If you wrote a sci-fi novel set in a world where astrology actually worked, you'd come up with a world far different than the one we live in. Astrology would be a priority project for the Pentagon, and NASA would be the most heavily-funded government agency of all. Apollo wouldn't have been about landing a man on the Moon, it would've been about building the ultimate deep-space telescope on the Dark Side.

Besides horoscopes, psychohistory is another aledged future-predicting method to be examined on its own terms.