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''Worlds Don't Care'' a science fiction story by American Interplanetary Society founder Nathaniel Schachner appears in Astounding Science Fiction magazine. Arthur C. Clarke composes a four page leaflet describing the aims of the BIS . "We have had a considerable quantity of these leaflets printed," wrote Clarke in the society's Bulletin. In the leaflet Clarke employs many ...

... 1939 22 Mar 23 1939 23 Mar 24 1939 24 Mar 25 1939 25 Mar 26 1939 26 Mar 27 1939 27 Mar 28 1939 28 Mar 29 1939 29 Mar 30 1939 30 Mar 31 1939 31 April 1939 April Apr 1 1939 1 Apr 2 1939 ...

... , member of the National Advisory Committee for Aeronautics NACA from its beginning in 1915 to 1939, and Chairman of National Advisory Committee for Aeronautics NACA from 1927 until ...

1930 1931 1932 1933 1934 1935 1936 1937 1938 1939

The free-flight tunnel placed into operation at Langley Aeronautical Laboratory . April 20-21: Experiments with four-bladed controllable propeller on Curtiss P-36 begun at Wright Field.

September 3-4: RAF Bomber Command carried out first night propaganda raid, dropping leaflets over Hamburg, Bremen, and the Ruhr. On September 27, British Air Ministry announced that the RAF had dropped 18 million leaflets over Germany since the beginning of the war. When leaflet bombing was suspended on April 6, 1940, Bomber Command had dropped 65 million leaflets.

... 1938) had led to five different families of low-drag wings by the end of 1939.

Maurice K. Hanson publishes the second edition of the first British science fiction fanzine Novae Terrae . In 1939 Hanson will become the mathematician on the British Interplanetary Society 's lunar spacecraft committee. Image:apr1936novaeterrae.jpg

... which had been off for seven months while Salyut 6 was unmanned. The crew began April 11 to unload Progress 8 and activate systems and instruments including plant-life installations Oaziz ... 8 's propulsion unit for another orbit adjustment April 24. On April 25 they separated the freighter from the Salyut-Soyuz complex; on April 26 they ignited the propulsion unit at 9:54 ... Times, Apr 11/80, D-15; Nature, Apr 17/80, 585) March 1980 March April 1980 April Apr 1 1980 1 Apr 2 1980 2 Apr 3 1980 3 Apr 4 1980 ...

Seven Mercury astronauts completed training session at the Navy Aviation Medical Acceleration Laboratory, Johnsville, Pa. April 1-May 3 Members of Space Task Group STG presented guidelines for an advanced manned ... Task Group STG , " Guidelines for Advanced Manned Space Vehicle Program ," June 1960, pp. 39-46.'' April 1960 April Apr 1 1960 1 Apr 2 1960 2 Apr 3 1960 3 Apr 4 ...

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