1920 December 10 meeting of the Royal Astronomical Society

1920 December 15 meeting of the Royal Meteorological Society

1920 December 29 meeting of the British Astronomical Association

1920 December 3 geophysical discussion

1920 February 13 meeting of the Royal Astronomical Society

1920 February 18 meeting of the Royal Meteorological Society

1920 February 25 meeting of the British Astronomical Association

1920 February 5 meeting of the Royal Society

1920 February 6 geophysical discussion

1920 January 21 meeting of the Royal Meteorological Society

1920 January 28 meeting of the British Astronomical Association

1920 January 9 meeting of the Royal Astronomical Society

1920 June 11 meeting of the Royal Astronomical Society

1920 June 16 meeting of the Royal Meteorological Society

1920 June 18 geophysical discussion

1920 June 30 meeting of the British Astronomical Association

1920 March 12 meeting of the Royal Astronomical Society

1920 March 17 meeting of the Royal Meteorological Society

1920 March 31 meeting of the British Astronomical Association

1920 March 5 geophysical discussion