Unlike some other reproductions of classic texts (1) We have not used OCR(Optical Character Recognition), as this leads to bad quality books with introduced typos. (2) In books where there are images such as portraits, maps, sketches etc We have endeavoured to keep the quality of these images, so they represent accurately the original artefact. Although occasionally there may be certain imperfections with these old texts, we feel they deserve to be made available for future generations to enjoy.

Galileo's groundbreaking dialogues are a summation of three decades of scientific work he had undertaken in the fledgling field of physics. This edition includes the diagrams crucial for understanding the text. Writing these dialogues in 1638, the elderly Galileo had a life of achievements behind him. Despite attempts at suppression of his writings by the Roman Inquisition, his ideas were successfully communicated across Europe. The motion of objects and resistance to such motion, the concept of velocity, and the laws of gravity are merely a few of the topics covered in these detailed dialogues. At the outset, we are introduced to the three conversation partners: Salviati, Sagredo and Simplicio. These three Venetians embark on a scientific discussion, hoping to explain the curiosities of things such as speed and movement. Over the course of four days, their meetings grow in complexity and scope as they strive to explain physical phenomena.

New to Penguin Classics, the astonishing story of the Copernican Revolution, told through the words of the ground-breaking scientists who brought it about In the late fifteenth century, it was believed that the earth stood motionless at the centre of a small, ordered cosmos. Just over two centuries later, everything had changed. Not only was the sun the centre of creation, but the entire practice of science had been revolutionised. This is the story of that astonishing transformation, told through the words of the astronomers and mathematicians at its heart. Bringing together excerpts from the works and letters of Copernicus, Galileo, Kepler, Descartes, Newton and others for the first time, The Dawn of Modern Cosmology is the definitive record of one of the great turning points in human history. Edited with Translations, Notes and an Introduction by Aviva Rothman