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Ski jumping is a sport in which skiers go down a take-off ramp, jump and attempt to land the farthest down on the hill below. In addition to the length that skiers jump, judges give points for style. The skis used for ski jumping are wide and long (260 to 275 centimetres (100 to 108 in)). Ski jumping is predominantly a winter sport, performed on snow, and is part of the Winter Olympic Games, but can also be performed in summer on artificial surfaces – porcelain or frost rail track on the inrun, plastic on the landing hill.
The true sport of ski jumping originates from Morgedal, Norway. Olaf Rye, a Norwegian lieutenant, was the first known ski jumper. In 1809, he launched himself 9.5 metres in the air in front of an audience of other soldiers. By 1862, ski jumpers were tackling much larger jumps and traveling longer. Norway's Sondre Norheim jumped 30 metres over a rock without the benefit of poles. His record stood for three decades. The first proper competition was held in Trysil. The first widely known ski jumping competition was the Husebyrennene, held in Oslo during 1879, with Olaf Haugann of Norway setting the first world record for the longest ski jump at 20 metres. The annual event was moved to Holmenkollen from 1892, and Holmenkollen has remained the pinnacle of ski jumping venues.
 Olympic competition
According to the International Olympic Committee's site  Ski jumping has been part of the Olympic Winter Games since the first Games in Chamonix Mont-Blanc in 1924. The Large Hill competition was included on the Olympic programme for the 1964 Olympic Games in Innsbruck.
Today, World Cup ski jumping competitions are held on three types of hills:
Normal hill competitions
- for which the calculation line is found at approximately 80–100 metres (260–330 ft). Distances of up to and over 110 metres (360 ft) can be reached.
Large hill competitions
- for which the calculation line is found at approximately 120–130 metres (390–430 ft). Distances of over 145 metres (476 ft) can be obtained on the larger hills. Both individual and team competitions are run on these hills.
- for which the calculation line is found at 185 metres (607 ft). The Ski Flying World Record of 239 metres (784 ft) is held by Bjørn Einar Romøren, and was set in Planica, Slovenia in March 2005.
Amateur and junior competitions are held on smaller hills.
- Wikipedia Ski Jumping