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Why do we say a longer Tachanun on Mondays and Thursdays compared to the other days of the week?

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up vote 3 down vote accepted

I found three reasons in Aruch HaShulchan 234. Here's my summary:

  1. These are days of acceptance (רצון). The reason for this being that Moshe Rabeinu ascended Mt. Sinai for the second tablets on Thursday and descended on Monday.

  2. These are days of judgment (דין). The courts in heaven and the earthly courts convene on these days. The sign for this is that the Maadim (Mars).

  3. Three zekanim (scholars) who were miraculously saved from a bishop who tried to burn them established this minhag.

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Summarizing the summarized reasons here would be helpful, specially for those of us who read English but not Hebrew. – msh210 Jul 5 '11 at 21:48
@msh210 Here in Israel it is passed midnight ... I'll try to do just that b"n tomorrow. Thanks for the remark. – David Perlman Jul 5 '11 at 21:52
David, what is your basis for saying that the many reasons is an indication of "trouble establishing" as a minhag – YDK Jul 5 '11 at 21:56
@YDK First, it is very long and repetitive and most people I know are pretty happy when there is any reason not to say it. Second, is that the Beit Yosef had to label one who doesn't say it standing a poretz gader. – David Perlman Jul 5 '11 at 22:08

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