Biography:Flamsteed was, in 1675, made "The King's Astronomical Observator" and with this became the first Astronomer Royal. In this role, he laid the foundation for the internationally-renowned Royal Greenwich Observatory.
He is best known for preparing the Catalogus Brittanicus, which catalogued 3,000 stars; and for his star atlas, Atlas Coelestic. He was also the first to observe Uranus, which he mistook for a star.