ISAAC NEWTON was without doubt a star amongst men. Possibly the most brilliant and influential scientist who ever lived. When we think of him we usually think of Cambridge, where he discovered the law of gravity but Newton was also a Londoner. He lived in the capital for thirty years and for some of that time, right here on the site of Westminster Library where he built an observatory on the top floor of his house (which at that time offered him a dark and unobstructed view of the heavens). Professor ROB ILIFFE joins us to tell how Newton became interested in astronomy, how he interacted with contemporary astronomers, and how his work was crucial for astronomy in the eighteenth century.