History of radar for various purposes; on the Shuttle Radar Topography Mission, the entire planet was mapped at a 30-m resolution. The Jodrell Bank Observatory, an operation of the University of Manchester in Britain, was originally started by Bernard Lovell to be a radar astronomy facility. It initially used a war-surplus GL-II radar system operating at 71 MHz (4.2 m). The first observations were of ionized trails in the Geminids meteor shower during December 1945. While the facility soon evolved to become the third largest radio observatory in the world, some radar astronomy continued. The largest (250-ft or 76-m in diameter) of their
The December Group evolution of contemporary representational paintings in the trends of form. It should be noted that close understanding within this group of artists is their tendency to form geometrization, that became leading aesthetic characteristics of this period. After the dissolution of the group its members continued on their separate ways to mould picture of modern Serbian art in the second half of the 20th century. The December Group The December Group (, "Decembarska grupa") was a Serbian artistic group founded in Belgrade in 1955. It ceased to exist in 1960. Group members were: Zoran Petrović, Miloš Bajić, Aleksandar Luković, Lazar Vujaklija,