International Olympic Committee Vikelas as its first president. As of June 2017, its membership consists of 95 active members, 41 honorary members, an honorary president (Jacques Rogge) and one honour member (Henry Kissinger). The IOC is the supreme authority of the worldwide modern Olympic movement. The IOC organises the modern Olympic Games and Youth Olympic Games, held in summer and winter, every four years. The first Summer Olympics organised by the IOC was held in Athens, Greece, in 1896; the first Winter Olympics was in Chamonix, France, in 1924. Until 1992, both Summer and Winter Olympics were held in the same year. After
Ancient Olympic Games to Timaeus, whom Eratosthenes may have imitated. The Olympic Games were held at four-year intervals, and later, the ancient historians' method of counting the years even referred to these games, using the term "Olympiad" for the period between two games. Previously, the local dating systems of the Greek states were used (they continued to be used by everyone except the historians), which led to confusion when trying to determine dates. For example, Diodorus states that there was a solar eclipse in the third year of the 113th Olympiad, which must be the eclipse of 316 BC. This gives a date