Professor Eric Forbes left behind at his death an important collection of the letters of John Flamsteed (1646-1719), First Astronomer Royal. A leading figure in the final phases of the seventeenth-century scientific revolution, his extensive correspondence with 129 British and foreign scholars all over the world touches on many of the scientific discussions of the day. A detailed, scholarly work of reference, The Correspondence of John Flamsteed, The First Astronomer Royal: Volume 1 is an essential guide to the exciting developments in scientific thinking that occurred during the seventeenth century. It supplements the published correspondence of Isaac Newton and Henry Oldenburg, and will be an invaluable research tool, not only for historians of astronomy, but also for researchers examining how scientific thought developed.