This groundbreaking work by the English scientist Isaac Newton is one of the most important works in the history of science. Published in 1687, it laid the foundations for modern physics and mathematics, introducing the concept of gravity and explaining the movements of celestial bodies. This edition includes the first three sections and part of the seventh section of the work, with extensive annotations and commentary to help readers understand the significance and context of Newton's ideas.This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it.This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work.Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.