adar sheni การใช้

I understand that the Hebrew Religious Calendar back in the turn of the century B . C . to A . D . had a Leap Year every six years where a month was added ( Adar Sheni ).
The intercalary month could be a second Sixth Month ( Ululu II ), as often practiced in Mesopatamia, or a second Twelfth Month ( Adar II, Adar Sheni, or ve-Adar ) as consistently practices in Israel.
Yom Kippur Katan ( literally, the little Yom Kippur )-which is held on the 29th of Heshvan, Tevet, Shevat, Adar, ( Adar Sheni in a leap year ), Iyar, Sivan, Tammuz and Av . Special selichot are recited during the mincha service on those days . If the 29th of those months falls on a Friday or a Sabbath, it is observed on the Thursday prior.