Kometographia. Or A discourse concerning comets : wherein the nature of blazing stars is enquired into: with an historical account of all the comets which have appeared from the beginning of the world unto this present year, M.DC.LXXXIII. : Expressing the place in the heavens, where they were seen, their motion, forms, duration; and the remarkable events which have followed in the world, so far as thay have been by learned men observed. : As also two sermons occasioned by the late blazing stars. /