Carolina Herschel, sister of William Herschel, was an indispensable companion and assistant throughout his career as an astronomer. He had originally rescued her from the life of household drudge to her family in Hanover, and brought her to England to train as a singer, a career in which she showed much promise. But as his astronomical observations improved and increased she became his assistant, and helped him in his great work of systematically sweeping the night sky visible through the large telescope that he had constructed at Slough, near Windsor. At the end of the eighteenth century the standard British work on the stars was the Historia Coelestis by John Flamsteed, the first Astronomer Royal under Charles II, and Fellow of the Royal Society, but it was becoming increasingly inaccurate, and consequently hampering Herschel’s work. He persuaded his sister to undertake a list of the errors in Flamsteed’s work, and this volume is the result, published by the Royal Society and containing also an index to Flamsteed’s observations.