Olympiad of the games are so scanty that historians are not certain whether after 261 they were still held every four years. During the early years of the Olympiad, any physical benefit deriving from a sport was banned. Some winners were recorded though, until the last Olympiad of 393AD. In 394, Roman Emperor Theodosius I outlawed the games at Olympia as pagan. Though it would have been possible to continue the reckoning by just counting four-year periods, by the middle of the 5th century AD reckoning by Olympiads had become disused. The modern Olympiad is a period of four years, beginning
International Astronomy Olympiad International Astronomy Olympiad The International Astronomy Olympiad (IAO) is an internationally recognized annual astronomy scientific-educating event for high school students (14–18 years old), which includes an intellectual competition between these students. It is one of the International Science Olympiads. The Eurasian Astronomical Society founded the IAO in 1996. The competing part of IAO consists of three rounds: a theoretical, an observational, and a practical. Problems of the theoretical round involve classical problems in branches of astronomy, astrophysics, space and planetary physics, and maybe hypothetical situations. The observational round involves recognizing stars, constellations, estimating star magnitude and angular distance, working with