On which days and times is Tachanun/Nefilat Apayim omitted due to festive or semi-festive character?

PrayerTachanun

Synopsis

The Mechaber and Rema enumerate a long list of days when Nefilat Apayim is not recited, including Tu B'Av, Tu BiShvat, Rosh Chodesh (and Mincha preceding it), Chanukah, Purim, Lag BaOmer, Erev Yom Kippur, Erev Rosh Hashana, the entire month of Nissan, the 9th of Av, the period between Yom Kippur and Sukkot, and from Rosh Chodesh Sivan through Shavuot (Rema).

Early Acharonim
Lenient
Strict
Lesser cited
Major authority

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