GUIDE: CRL Reference Folder #27 These records are in the Public Record Office of Great Britain, the Royal Greenwich Observatory (PRO RGO 1-3: formerly RGO 1-135). The microfilm set contains the papers of the first three Astronomers Royal:

• John Flamsteed, 1675–1719 (RGO 1/1-76)
• Edmond Halley, 1720–42 (RGO 2/1-19)
• James Bradley, 1742–62 (RGO 3/1-45).

Also included are a small number of the papers of Nathaniel Bliss, 1762–64. The records are sufficiently complete to be representative of the work of the Royal Observatory from its foundation in 1675 by King Charles II. They contain observation and computation books, star catalogs, notes, and private and official correspondence.