A rare print showing Astronomer Royal, John Flamsteed, and two assistants at work in the Octagon Room at the Royal Observatory, Greenwich. Portraits of the Observatory's royal patrons, Charles II and James II, are above the door, and celestial observations are being made using a teleascope and large quadrant. Shipping on the River Thames is visible through the left-hand window.
This was one of nine prints used to illustrate Edmund Halley's rare edition of Flamsteed's 'Historiae Coelestis'. The edition was not approved by Flamsteed, and he destroyed many copies. Lettered versions of the print include the title in Latin 'Prospectus intra Cameram Stellatam'. This version is a proof before letters and therefore particularly rare. The print was an important source for the museum's refurbishment of the Octagon Room in the 1980s.