This book takes its origin in a course of lectures on the history and progress of Astronomy arranged for Sir Oliver Lodge in the year 1887. The first part of this book is devoted to the biographies and discoveries of well known astronomers like Copernicus, Brahe, Kepler, Galileo and Newton. In the second part, the biographies take a back seat, while scientific discoveries are discussed more extensively, like the discovery of Asteroids and Neptune, a treatise on the tides and others. (Summary by Availle)