Wladimir Peter Köppen (German pronunciation: [vlaˈdiːmiːɐ̯ ˈkœpm̩, ˈvlaːdimiːɐ̯ -]; Russian: Влади́мир Петро́вич Кёппен, romanized: Vladimir Petrovich Kyoppen); 25 September 1846 – 22 June 1940) was a Russian-German geographer, meteorologist, climatologist and botanist. After studies in St. Petersburg, he spent the bulk of his life and professional career in Germany and Austria. His most notable contribution to science was the development of the Köppen climate classification system, which, with some modifications, is still commonly used. Köppen made significant contributions to several branches of science, and coined the name aerology for the science of measuring the upper air / atmosphere.
Ganesh Ghosh born in a Kayastha Family which hailed from Chittagong, now in Bangladesh. In 1922, he took admission in the Bengal Technical Institute in Calcutta. Later, he became a member of the Chittagong Jugantar party. He participated in the Chittagong armoury raid, along with Surya Sen and other revolutionaries on 18 April 1930. He fled from Chittagong and took shelter in Chandannagar, Hooghly. After few days police commissioner Charles Tegart attacked the safe house of them in Chandannagar and arrested him. One young fellow revolutionary Jiban Ghoshal Alias Makhan killed by the police at time of arrest operation.