Even after more than three centuries and the revolutions of Einsteinian relativity and quantum mechanics, Newtonian physics continues to account for many of the phenomena of the observed world, and Newtonian celestial dynamics is used to determine the orbits of our space vehicles.This completely new translation, the first in 270 years, is based on the third (1726) edition, the final revised version approved by Newton; it includes extracts from the earlier editions, corrects errors found in earlier versions, and replaces archaic English with contemporary prose and up-to-date mathematical forms. Newton's principles describe acceleration, deceleration, and inertial movement; fluid dynamics; and the motions of the earth, moon, planets, and comets. A great work in itself, the Principia also revolutionized the methods of scientific investigation. It set forth the fundamental three laws of motion and the law of universal gravity, the physical principles that account for the Copernican system of the world as emended by Kepler, thus effectively ending controversy concerning the Copernican planetary system.The illuminating Guide to the Principia by I. Bernard Cohen, along with his and Anne Whitman's translation, will make this preeminent work truly accessible for today's scientists, scholars, and students.

    Around its mystical powers has grown a centuries-old ritual and a fascinating, intricate discipline. This unique guide unlocks the mysteries of this ancient ritual practice, explaining the history and significance of swords in the samurai culture, and documenting the techniques of swordsmanship, as no other book in English does.IAI: The Art of Drawing the Sword is a thorough examination of the traditional Japanese martial art of iaijutsu. Included in this volume are introductions to sword care and selection; general etiquette and the training uniform and gear; proper basic sword procedure; sword techniques and drills for practice and demonstrations; kata; and sword testing; as well as the story of the Chushingura (the 47 Ronin). Generously illustrated with black and white photographs and line drawings, IAI: The Art of Drawing the Sword is a storehouse of information for both the aspiring student and the experienced swordsman.