In many, if not all, of the Nusach Sefard synagogues I've prayed at, the synagogue does not say Tachanun during Mincha during regular weekdays.
What is the source for this practice?
In many, if not all, of the Nusach Sefard synagogues I've prayed at, the synagogue does not say Tachanun during Mincha during regular weekdays.
What is the source for this practice?
See here where they suggest:
1 they often daven until after shkiya, and according to many opinions tachanun may not be said after shkiya, so a blanket rule was instituted so as never to come to saying after shkiya, which in some kabbalistic sources danger is associated with this practice.
2 tachanun by mincha requires intense concentration, which most people don’t have in the middle of their day
3 after it is night in Israel tachanun should not be said even in other parts of the world
Sources: Sefer Nimukei Orach Chaim, Shu”T Dvar Yehoshua Y:D 3:74, Zivchei Zedek siman 9 [minhag bagdad], Sefer Shulchan Hatohar Siman 22.