Tachanun is a prayer of supplication and confession recited during Shacharit and Mincha. On certain special days, it is customary not to say Tachanun.
Days When Tachanun Is Omitted
- Shabbat
- All major holidays – Rosh Hashana, Yom Kippur, Sukkot, Shemini Atzeret, Simchat Torah, Passover, and Shavuot
- Hanukkah – all eight days
- Purim and Shushan Purim (15th of Adar)
- Tu B'Shvat (15th of Shevat)
- Lag B'Omer (33rd day of the Omer)
- Rosh Chodesh (the new month)
- Yom Yerushalayim (28th of Iyar)
- Yom Ha'atzmaut – Israeli Independence Day (5th of Iyar)
- A house with a Chatan (groom) – during the week of the wedding
- A house with a Brit Milah – on the day of the circumcision
- Erev Yom Kippur, Erev Passover, Erev Shavuot
The app automatically marks in the daily view whether Tachanun is omitted on that day, so you never have to remember on your own.