Baltimore, MD - Nov. 8, 2018 - As is well known, Rosh Chodesh Kislev and Teves are sometimes one day and sometimes two. This causes numerous halachic issues in regards to Bar Mitzva’s and yaartzeit’s. In this half-hour shiur delivered at a Lunch and Learn in Pikesville, Rabbi Dovid Heber explains why the calendar changes from year to year, its halachic implications, and this phenomenon’s connection to Chanukah.