Who knows fifty-nine?
Please cite/link your sources, if possible. At some point in the next few days, I will:
Upvote all interesting answers.
Accept the best answer.
Go on to the next number.
59 are (usually) the number of days in two consecutive Jewish months, since mostly they alternate between 29 and 30 days.
For halachic purposes, too, the 59th day can count as the last one of a two-month period. Thus, if one accepts on himself two consecutive periods of naziriteship, he may end them respectively on the 30th and 59th days (although it's preferable to keep 30 full days of naziriteship each time, and thus to bring his offerings on the 31st and 61st). (Rambam, Hil. Nezirus 4:2)
Fifty-nine are the minimum parts (by volume) of kosher food into which one part non-kosher food can be added, leaving the mixture kosher, in the following limited cases:
I think I just realized why Shach and others write 60 as ס׳ but spell out 59 as חמשים ותשע (besides the fact that 60 occurs far more often in hilchos kashrus than 59) -- because נ״ט would be too easily confused for another term in hilchos kashrus, נותן טעם.
In Bavel, they asked for rain (tal umatar) 59 days AFTER Tekufas Tishrei (Taanis 10a). [The 60 days mentioned in this context is including the day of the tekufah.]