Olympiad Olympiad An Olympiad (, "Olympiás") is a period of four years associated with the Olympic Games of the Ancient Greeks. During the Hellenistic period, beginning with Ephorus, it was used as a calendar epoch. Converting to the modern BC/AD dating system the first Olympiad began in the summer of 776 BC and lasted until the summer of 772 BC, when the second Olympiad would begin with the commencement of the next games. By extrapolation to the Gregorian calendar, the 3rd year of the ((2019+779)/4 -.5)round 0th Olympiad began in (Northern-Hemisphere) mid-summer 2019. A modern Olympiad refers to a four-year period
Chinese Chemistry Olympiad Chinese Chemistry Olympiad Chinese Chemistry Olympiad () is an annual academic competition held by Chinese Chemical Society. CAS changed its official Chinese name in February 2014, though its English translation remains the same. The first CChO was held in 1984, 16 years after IChO. The event has been held every year since then. China has selected excellent high school students to take part in IChO through the competition since 1987. It is considered to be the most difficult Chemistry exam throughout the world, the difficulty of Final round is much harder than IChO. The difficulty of the preliminary round is