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According to this answer, we don't say tachanun on days that are yemei simcha -- days of happiness.

But the Talmud (Taanit 29a) says Mishenichnas Adar marbim b'simcha -- once Adar begins we increase happiness. Seemingly this applies at least until after Purim (14th and 15th of Adar).

But if we don't say tachanun in the entire of Nisan because we don't say it for the majority of the month (the rov), then why do we say it during Adar?

1

While the Talmud does indeed say that, neither the Rambam or the Shulchan Aruch mention it. Chasam Sofer (OC 160) explains why:

The statement of the Talmud (Taanit 29a) "Just as when Av begins we decrease in happiness, so too when Adar begins we increase happiness" is Rav's opinion, following his opinion that the mourning of Tisha B'Av applies to the entire month. Thus, just like by Av the mourning applies to the entire month, so too by Adar, the happiness applies to the entire month.
However, we do not hold that the mourning applies to the entire month1, and therefore there is no longer any reason to say that we should increase in happiness during the entire month of Adar.


1 See Taanit 30a.

(Credit: Double AA)

  • Even according to the way we pasken, Adar 1-15 are still yimei simcha – DonielF Jun 25 '18 at 17:28
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    @DonielF Do you have a source for that? – Ploni Jun 25 '18 at 17:32
  • According to the Chasam Sofer’s comparison of Adar to Av, just like we are sad because of Tishah B’av and only until Tishah B’av, in Adar, when we’re happy because of Purim, we should be happy until Purim. – DonielF Jun 25 '18 at 17:35
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    @DonielF we are not sad "because of Tishah B’av and only until Tishah B’av". Halachicly, the mourning period is only the week of and only until Tisha B'Av. – Ploni Jun 25 '18 at 19:31
  • You Sefardim can mourn for just the week. Us Ashkenazim will keep doing the full nine days. – DonielF Jun 25 '18 at 19:32

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