An epitome of astronomy, with a concise history of its origin and progress : Being a companion to the lectures given on the dioastrodoxon, or, New transparent orrery, twenty-one feet diameter, By R.E. Lloyd. To which is added, an essay on the nature and appearence of Comets, (with an attempt to point out the errors of the present theory) and an apology for an enquiry into a new and more rational hypothesis. Price one shilling.