A commonplace book of lunar calculations, c. 1684 (85r-182v, with a guide at 183v-184r); copy letters, 1679-1700; and notes; 193 folios. The writing is in Flamsteed's hand, with the exception of the letters, which are copied in various hands, but sometimes bear Flamsteed's corrections.

The letters are comprised of correspondence with Johann Hevelius, 1679-1685; letters from Edmond Halley, 1679; correspondence with Olaus Römer, 1679; letters to Seth Ward, 1679; letters to Edward Sherburne on the history of the Greenwich Observatory, 1682; correspondence with J.D. Cassini, 1682-1683; letters to Johann Jacob Zimmermann, 1682-1683; letters to William Molyneux, 1682-1691; letters to P. Carolo Balsamo, 1684; letters from Thomas Heathcott, 1683; letters to J. Ciampini, 1684, with his letters to Croone; letters to 'Micaelus Weihelius', 1684; letters from Franciscus Blanchinus [Bianchini], 1685; letters to Gottfried Kirch, 1686-1691; letters to Bernardus Trevisanus, 1686; letters from George Ashe at Vienna, 1690; letters to Isaac Newton, 1692-1694; a draft to [Glen] about earthquakes, 1692; letters to Caswell on the parallax of the pole star, 1698; and a draft letter to Lowthorp, 1699.

The volume also includes mathematical notes from one of Newton's lectures, 1674 (1v); 'Phaenomenon 1m Geocosmicum' and '...2m Selenographicum', about a Mainz earthquake, by M[ichael] W[eihel], 1682 (30r-31v); accounts 'of the Monsoon at Metchlepatan' and of a thunderstorm at sea (37r-38v); a copy of observations by G.C. Eimmart of Nuremberg, 1691 (59v-60r); Thomas Burnet's reply to criticisms of a paper on the planets, with notes on this and on his Telluris Theoria Sacra, 1693 (77r-78r); notes on icebergs, mostly from 'Mr Halley's letter to the Secretary to the Admiralty', 1700 (84r); a 'Table of latitudes ... collected from Riccioli and others' (84v); a list of 'Bookes in my Library' (186v-191r); notes of personal expenses, 1683 (192v-193r); and a note on tides at Greenwich, 1681 (193v).