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Photocopies of 'Rapports Annuels sur L'Etat de L'Observatoire de Paris', Vol. I, 1878-1883, and Vol. II, 1884-1892, by Amiral Ernest Mouchez, directeur, originally published in Paris, 1879-1893. The final annual report is by a new director, F. Tisserand.

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Correspondence regarding the instruments of the Royal Observatory, Cape of Good Hope, including a report on a visit to the Paris Observatory to discuss problems concerning the astrolabe, 15-19 July 1963, and correspondence regarding the 40-inch reflecting telescope.

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Correspondence regarding French observatories, including the Paris Observatory and Meudon Observatory. There is also a paper by A. Danjon, in French, on 'The Analysis of Inequalities in the Rotation of the Earth'.

Scope and Contents Correspondence relating to longitude and its determination, including the following material:(1) Correspondence regarding the Potsdam-Greenwich Longitude via Emden and Bracton, 1902-1904.There is correspondence with C.T. Albrecht regarding accommodation, equipment and arrangements with the General Post Office (G.P.O.); correspondence with the G.P.O. regarding the line between the Royal Observatory and Potsdam; and a copy of 'Longitude Difference between Potsdam and...

Scope and Contents Official correspondence with the General Post Office, Ministry of Works, Meteorological Office, Admiralty and others regarding solar physics, including letters concerning the Radar mirror for the Paris Observatory, including correspondence between the Allied Control Commission for Germany and H. Spencer Jones, 1947; correspondence regarding geomagnetic disturbances affecting General Post Office radio data and reports on sun spots and solar flares, 1947; and a report on the 'Solar Location...

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Correspondence with M. Baillaud, Paris Observatory, regarding the Royal Greenwich Observatory's work for the Carte du Ciel, including a copy of the proposed programme for the development of this work.

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Correspondence regarding the Paris Observatory, including correspondence with A. Danjon and comments by M. de Vaucouleurs on 'some remarks on the value of the solar parallax'.

Scope and Contents Correspondence regarding time signals, including duration, frequency, times, coordination of signals, equipment adjustments, replies to queries regarding radio time signals, clocks and the publication of lists of signals, the discontinuation of vernier radio time signals, reception reports and maintenance. The papers include the following items:Royal Greenwich Observatory circulars on solar activity, time signal adjustments and international time signals,...

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An undated photostat of a letter in French from Monsieur Jeaurat, Paris Observatory, to Nevil Maskelyne, 25 September 1789, regarding the return of a comet and informing him of a forthcoming visit to Italy and England.

Scope and Contents Letter from G. MacKinley regarding vacancies as the secretary of a learned society, 1889.Obituary notice for C.F.H. Magnon of Paris, 1888.Letter from Lord McLaren regarding Dr Copeland's visit to the Royal Astronomical Society, with a reply, 1888.Letter to Captain Sir F. Evans regarding appointments in the Royal Observatory and at the Cape, 1883.Letter from M. le Chevalier of Paris regarding a memorial to A. Rabelais, 1879, with a printed notice of the...

Scope and Contents (1) Letters regarding the existence of Neptune, 1846-1878Duplicate copies of collected correspondence on the investigations of J.C. Adams and U.J.J. Le Verrier into the existence of Neptune and in particular of the ensuing controversy over the name of the planet. There are also other letters concerning the minor planets and mathematical formula for their orbits, the Moon's equation and lunar acceleration. The correspondents include J.C. Adams, Sir George Airy, F.N.M. Arago, J....

Scope and Contents Correspondence between David Gill and various individuals, including members of other observatories, divided into nineteen sections:Professor R.H. Tucker, W.W. Campbell, J.E. Keeler and E.S. Holden of the Lick Observatory, April 1896 - January 1900.W.H. Maw, London, 21 February - 13 June 1899.Professor Simon Newcomb, Washington, 13 January 1896 - 31 January 1900.H.F. Newall, Cambridge, 3 March - 9 October 1899.Professor Vogel and Dr G. Muller, Potsdam,...

Scope and Contents Correspondence with the Director, Paris Observatory, 1886, regarding a proposal to hold a conference to discuss an astrographic chart of the heavens, with a draft programme of discussions and correspondence with G.G. Stokes regarding his attendance to represent the Royal Society and the Astronomer Royal's acceptance of the invitation to represent the United Kingdom.Correspondence with A.A. Common and W. Huggins regarding the Royal Astronomical Society Committee and its membership,...

Scope and Contents Correspondence with G.G. Stokes regarding the establishment of an observatory in New Zealand, 1887.Correspondence with the Agent General of Victoria regarding the purchase of instruments for the Melbourne Observatory, 1887, including the acceptance of Grubb's tender for the supply of 13-inch astrographs.Correspondence with the Melbourne Observatory, 1888-1892, regarding a suitable mounting for the astrographic telescope and the plates for use with it.Correspondence...

Scope and Contents (1) Papers regarding various overseas observatoriesPapers relating to the closure of Perth Observatory, Western Australia, 1912-1913, including letters from the Royal Society, the Royal Astronomical Society and Sir David Gill and correspondence with Downing Street and the Agent General for Western Australia.Papers relating to the comparison of Greenwich and Helwan Observatory photographs on the introduction of the new telescope at Helwan, 1909-1912.Correspondence with...

Scope and Contents (1) Papers relating to small planets and satellites, 1881-1912Correspondence with Paris Observatory, 1881, concerning observations of minor planets for the period ending 31 December 1880.Letter from D. Gill, Cape of Good Hope Observatory, 1881, regarding observations of minor planets to determine solar parallax.Telegrams concerning the discovery of new minor planets, 1882-1892.Correspondence with R. Bryant concerning perturbations of Sappho,...

Scope and Contents Correspondence with Professor Safford, 1894, concerning errors in the 1860 Star Catalogue: north polar distance of 16 Persei.Letter from G. Dunn concerning 73 Leonis being a variable, 1894.Letter from S. Newcomb, 1894, concerning the north polar distance of standard stars during 1891-1893, with a reply including the Greenwich observations for 1891.Correspondence with Major Gore, R.E., concerning the place of double stars, 1894-1895.Letter from Professor...

Scope and Contents Correspondence with the Nautical Almanac Office and related papers, in fifteen sections, including the following material:(1) Astronomical navigation tablesCorrespondence with D.H. Sadler regarding George G. Hoehne's 'Practical Celestial Air Navigation Tables', 1943.Correspondence with D.H. Sadler regarding astronomical tables, 1942.Memorandum by Sadler titled 'Polar Navigation. A Device for Drawing Position Lines within 15 Degrees of the Pole',...

Scope and Contents Correspondence and papers regarding time signals, including the following items:Correspondence between H. Spencer Jones, H.M. Smith and the Admiralty concerning equipment required and installations at Abinger, clock radio receivers and aerial systems, 1952-1955.Correspondence with Central Rediffusion Services Ltd and the Admiralty concerning the availability of the 6 pips time signal for the Independent Television Authority, 1955.Correspondence between R. Atkinson and...