Under the Julian calendar, Christmas fell on Jan. 6. When the new Gregorian calendar came into use, Christmas was moved to Dec. 25; but some in Britain kept celebrating it on Jan. 6. Some of them moved to the New World and kept on celebrating Christmas in Appalachia on Jan. 6. A few churches still celebrate it then and call it “Old Christmas.” There is a sense, however, in which Christmas should never get old to us.