The certainty, time, and end, of the birth of our Lord and Saviour Jesus Christ : with the accomplishment of several of the prophecys [as printed], relating thereto. A sermon, at the lecture, in Marblehead, December 25. 1729. To which is added, an appendix, attempting more clearly to state, the true year of our Lord's nativity. By John Barnard, V.D.M. of Marblehead.