true it has little to do with this topic. its interesting that that certain days like yom kipper can not fall out on a friday (im not 100 percent sure that is true im just using it as an example). the jewish calendar thing is a good idea
That1, Of course it is true that YK cannot fall out on a Friday. The whole business of “cannot fall out” throughout the calendar is because the first day of Rosh Hashanah cannot fall out on ? ? ?, meaning Sunday, Wednesday or Friday. Because of that requirement, YK cannot be on a Tuesday, Friday or Sunday. After that, depending on how many days of Rosh Chodesh Kislev and Teves has, that will determine how the rest of the calendar falls out for each given year.