By Tina Dennelly, Catholic News Agency - Thursday is the Ascension, the day the Church marks 40 days since Jesus’ resurrection and the day he ascended into heaven (see Acts 1:1–11). But depending on where you live, you may or may not be obligated to attend Mass on that day... If you live in the ecclesiastical provinces of Boston, Hartford, New York, Omaha, and Philadelphia, tomorrow is a holy day of obligation for you. That means if you live in New York, Connecticut, Rhode Island, Maine, Massachusetts, New Hampshire, Vermont, Nebraska, or Pennsylvania, you have to go to Mass!