By the 19th century astronomy had become a formal science. One of its chief popularisers was the schoolmaster Robert Goodacre (1777-1835) who developed a series of public lectures on the subject. These were famously lively affairs, which incorporated demonstrations of apparatus like globes, telescopes and planispheres, live experiments, and colourful, large-scale diagrams. So popular were Goodacre’s lectures that after a successful tour of Britain from 1821 to 1823, the schoolmaster spent the following two years in North America taking his scientific spectacle to twenty four venues. This poster advertises a series of six lectures to be delivered by Goodacre at the Great Yarmouth Mechanics’ Institution in May 1831.