The url can be found via the archive's API, and you can specify a timestamp.
http://archive.org/wayback/available?url=http://yorktownhist...
It returns a json with, notably, the closest archived page given the timestamp.
Re:Show HN: Hacker News Classics
by degenerate on Thursday February 22, 2018 @10:13PM
(#16443905)
That's way more fantastic than I thought their API would be! Thanks. Hope OP sees it.
Re:Show HN: Hacker News Classics
by mannykannot on Friday February 23, 2018 @06:56AM
(#16445772)
FWIW, #4 "Two 4000 ft plumb bobs hung down a mine shaft, with baffling results (1901)" can be found at http://www.lockhaven.edu/~dsimanek/hollow/tamarack.htm
Re:Show HN: Hacker News Classics
by madethemcry on Friday February 23, 2018 @02:48AM
(#16444860)
I also stumbled upon this too. The article was archived, I wonder why it's not redirecting. Now I'm finally enjoying this post too.
http://yorktownhistory.org/wp-content/archives/homepages/190...
(dead) http://yorktownhistory.org/homepages/1900_predictions.htm ===> https://web.archive.org/web/20100108205037/http://yorktownhi... (archive from 6 days later)
I don't think this can be done programmatically though... thanks for putting this together. I enjoy the old posts a lot, too.