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Alexander William Roberts

Alexander William Roberts, Scottish-born South-African astronomer (Farr, Sutherland 04 December 1857 – Alice, Eastern Cape 27 January 1938)
Authored over 100 works
Discovered some variable stars
With H.N. Russell demonstrated that the components of some of binary star systems are low-density stars with gigantic diameters 
Developed a visual photometer


Lunar crater Roberts