what is an olympiad?
A period of four years associated with the Olympic Games of the Ancient Greeks.
Olympiad
 a period of four years associated with the Olympic Games of the Ancient Greeks.
what does noble gas mean? Odorless, colorless, monatomic gases with very low chemical reactivity. who discovered the first nobel gas? Pierre Janssen and Joseph Norman Lockyer and which was it? Helium who is the former by profession? A French astronomer what kind of work does the astronomers do? They observe astronomical objects such as stars, planets, moons, comets and galaxies who are the amateurs in this profession? Some devote a few hours a month to stargazing and reading the latest developments in research, others assist professional astronomers in research. what academic background does it need? PhD in physics or astronomy from where did the latter term derive? Astron means star and nomia means law, mention some instances when such studies were done in ancient times? The Antikythera mechanism (c. 150–80 BC) was an early analog computer designed to calculate the location of the Sun, Moon, and planets for a given date. what is that mechanism? an ancient Greek hand-powered orrery, used to predict astronomical positions and also track the four-year cycle of athletic games which was similar to an Olympiad who made it? Greek astronomers during the second century BC
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Olympiad [SEP] Introduction
An Olympiad (, "Olympiás") is a period of four years associated with the Olympic Games of the Ancient Greeks. Although the Ancient Olympic Games were established during Archaic Greece, it was not until the Hellenistic period, beginning with Ephorus, that the Olympiad 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 Julian calendar, the 4th year of the ((2020+779)/4 -.5)round 0th Olympiad began in (Northern-Hemisphere) mid-summer 2020.