Who knows seventy-three?
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.
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The molad (average synodic lunar period) is expressed by Rabban Gamliel (in Rosh Hashanah 25a) as 29 1/2 days, 2/3 of an hour, and 73 chalakim (1 chelek = 3 1/3 seconds).
73 may have been the Sanhedrin of Shamaya and Avtalyon.
Both were converts to Judaism; there's some discussion whether they were full voting members of the Sanhedrin, or only served in an advisory, non-voting capacity (in which case 71 +2 = 73).
73 are the volumes of Schottenstein.
(It fits the beat!)
73 are the verses in Yoel.
73 is the number of answers to shiv'im mi yodeya!