Reciting Tachanun on a Postponed Tisha B'Av
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Question
Why is Tachanun not recited on a postponed Tisha B'Av? The reason for not reciting Tachanun is because Tisha B'Av is called a 'moed' (appointed time), and this refers to the 9th of Av, the day the spies returned. How is this related to our postponing the fast after Shabbat? It is clear that when the fasts turn into festivals in the time of redemption, the festival will be on Shabbat itself and not on Sunday.
Answer
Shalom Rav,
The reason Tachanun is not recited is indeed because 'Tisha B'Av is called a moed'.
However, this is not the only reason, and in fact, since it is mentioned in Eicha that it is called a 'moed', Tachanun is not recited.
Source
Shulchan Aruch, Orach Chaim, Siman 559, Se'if 4