Georgi Markov, a Bulgarian defector, was fatally stabbed by a poisoned umbrella point wielded by a Bulgarian secret agent in London, UK 

First commercially successful electric bus line opens (Hollywood) 

Max Wolf rediscovers Halleys comet 

President Kruger crosses border with Mozambique 

James Hopwood Jeans, British mathematician and scientist, is born 

David Thomas Graham, Scottish chemist, dies 

In Britain, the London to Brighton commuter express train began regular service, taking just 105 minutes 

Giovanni Domenico Cassini, Italian-French astronomer, dies