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
December Festival Hurdle December Festival Hurdle The December Festival Hurdle, currently known by its sponsored title of the Ryanair Hurdle, is a Grade 1 National Hunt hurdle race in Ireland which is open to horses aged four years or older. It is run at Leopardstown over a distance of about 2 miles , and during its running there are eight hurdles to be jumped. The race is scheduled to take place each year during the Christmas Festival meeting in late December. Prior to 2013 the race was named the Istabraq Festival Hurdle in honour of Istabraq, who won it four times. The race