A dissertation on comets. [electronic resource] : In three parts. Part I. A confutation of the principles of judicial astrology; wherein it is demonstrated, that comets cannot be presages of good or evil to man. Part II. The various theories of comets, according to the antients and moderns: a particular account of the comet which is now visible on the continent, and will soon be seen here; with the methods of determining it's course, velocity, magnitude, distance, heat, time of passing the perihelion, &c. With a catalogue of all the comets that appeared since the general deluge; and the mathematical elements of those that have been astronomically observed. Part III. Conjectures on the cause, phœnomena, and time of the general conflagration, according to Burnet and Whiston: with arguments from scripture and fathers for the succeeding period, called the millennium Compiled by John Donovan.