1900 April 3 meeting of the Royal Meteorological Society

1900 December 14 meeting of the Royal Astronomical Society

1900 December 19 meeting of the British Astronomical Association

1900 December 19 meeting of the Royal Meteorological Society

1900 February 21 meeting of the Royal Meteorological Society

1900 February 28 meeting of the British Astronomical Association

1900 February 9 meeting of the Royal Astronomical Society

1900 January 12 meeting of the Royal Astronomical Society

1900 January 17 meeting of the Royal Meteorological Society

1900 January 31 meeting of the British Astronomical Association

1900 June 20 meeting of the Royal Meteorological Society

1900 June 27 meeting of the British Astronomical Association

1900 June 8 meeting of the Royal Astronomical Society

1900 March 21 meeting of the Royal Meteorological Society

1900 March 28 meeting of the British Astronomical Association

1900 March 9 meeting of the Royal Astronomical Society

1900 May 11 meeting of the Royal Astronomical Society

1900 May 16 meeting of the Royal Meteorological Society

1900 May 30 meeting of the British Astronomical Association

1900 November 21 meeting of the Royal Meteorological Society