Royal Greenwich observatory |
Observations made with the Cookson floating zenith telescope in the years 1911-1918 at the Royal observatory, Greenwich, for the determination of the variation of latitude and the constant of aberration / under the direction of Frank Dyson |
London : published by His Majesty's stationery office, 1921. |
Royal Greenwich observatory |
Observations made with the Cookson floating zenith telescope in the years 1919-1927 at the Royal observatory, Greenwich, for the determination of the variation of latitude and the constant of aberration / under the direction of Frank Dyson |
London : published by His Majesty's stationery office, 1928. |