An introduction to the use of the globes, [electronic resource] : and the orrery: also, the application of astronomy to chronology; In which are contained Rules and Memorial Canons for finding the Dominical Letter, Leap-Year, Epact, Easter, &c. according to the Gregorian Account or New Style; with an Explication of the Reason of each Rule. Adapted to The Instruction and Entertainment of such Persons as are not previously versed in Mathematic Science. With an appendix, Attempting to explain the Account of the First and Fourth, Days Work of Creation in the First Chapter of Genesis. By David Jennings, D.D.