The other thing that I was really impressed by in the Royal Astronomical Society’s Library was the manuscript ‘observing book’ in which William Herschel described his observations of the planets, including the entry on 9th. September 1782 in which he sighted ‘My Planet’, which was Uranus – ‘the Planet extremely ill defined’.   He is the one and only person to have discovered a new planet from his observatory which he had recently moved from Bath to Slough:-