""A New Theory of the Earth and of Planetary Motion"" is a scientific book written by Mackey, Sampson Arnold in 1825. The book presents a new theory regarding the structure of the solar system and the motion of planets. It argues that the Sun is the vicegerent or representative of its own system, and that its gravitational force is responsible for the movements of the planets. The book provides a detailed explanation of the theory, including mathematical calculations and observations. The author also discusses other theories of planetary motion that were prevalent at the time, and provides a critical analysis of their strengths and weaknesses. This book is a significant contribution to the field of astronomy and planetary science, and provides an interesting perspective on the nature of our solar system.This scarce antiquarian book is a facsimile reprint of the old original and may contain some imperfections such as library marks and notations. Because we believe this work is culturally important, we have made it available as part of our commitment for protecting, preserving, and promoting the world's literature in affordable, high quality, modern editions, that are true to their original work.