On Thu, 11 Jul 2019, 00:09 Rich, Joel wrote: > Why are the rules for which days we don't say tachanun not parallel to > those for not saying lamenatzeach? The Levush (132:1) says because it's part of the Kedusha. Note that the question only arises in minhag Ashkenaz -- for Sephardim the rules _are_ the same for tahanun and lamenatzeah