1889 May 13 meeting of the Liverpool Astronomical Society

1889 May 15 meeting of the Royal Meteorological Society

1889 May 25 meeting of the Astronomical Society of the Pacific

1889 November 20 meeting of the Royal Meteorological Society

1889 November 26 meeting of the British Astronomical Association

1889 November 30 meeting of the Astronomical Society of the Pacific

1889 November 8 meeting of the Royal Astronomical Society

1889 September 28 meeting of the Astronomical Society of the Pacific

189 Phthia CCD Spectrum

1890 April 11 meeting of the Royal Astronomical Society

1890 April 16 meeting of the Royal Meteorological Society

1890 December 1 meeting of the Liverpool Astronomical Society

1890 December 12 meeting of the Royal Astronomical Society

1890 December 17 meeting of the Royal Meteorological Society

1890 December 31 meeting of the British Astronomical Association

1890 February 14 meeting of the Royal Astronomical Society

1890 February 19 meeting of the Royal Meteorological Society

1890 January 10 meeting of the Royal Astronomical Society

1890 January 25 meeting of the Astronomical Society of the Pacific

1890 June 13 meeting of the Royal Astronomical Society