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Why don't we say Avinu Malcanu on Tisha B' Av?

The Artscroll Siddur says "on fast days that tachanun is omitted...", is there any other reason?

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I once heard a nice vort: The month of Elul is the month of Avinu-Malkeinu. The month of Av is just plain Avinu (a much closer relationship) ... – David Perlman Aug 12 '11 at 9:17
Very similar: judaism.stackexchange.com/q/30016 – msh210 Jul 18 '13 at 15:23
up vote 1 down vote accepted

The main reason that I recall is because of the pasuk in Eichah (1:15) that refers to the day as "moed"

קָרָא עָלַי מוֹעֵד לִשְׁבֹּר בַּחוּרָי

I don't remember why that forces a connection.

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"I don't remember why that forces a connection" - The term מוֹעֵד is synonymous with "Yom Tov" in this context. SInce we omit Tachanun on Yom Tov we omit it on Tish'a B'Av. I think Art Scroll Eicha may explain why Tish'a B'Av was called a "Mo'ed" or what was meant in that verse. – DanF Jul 27 '15 at 16:58

My rav explained that Tachanun (which, is part of your question, per se, not necessarily the direct reason why Avinu Malkeinu) is omitted on occasions of either "extreme" - extreme joy or extreme sadness.

Yom Tov is "extreme joy" so Tachanun is omitted.

In a house of mourning during the week of shiva, Tachanun is also omitted. This is a location & time of extreme sadness.

If Tachanun is omitted in a house of mourning where one person is mourning, kal vachomer it should be omitted when all of B'nei Yisra'el is mourning!

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Edited to change my answer. Here is a link that explains why we don't say Avinu Malkeinu on Tisha B'Av.

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It would be useful if you summarized the linked webpage, even in just one or two sentences. – Tiberia Nov 29 '11 at 5:39

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