Burning glass extremely high temperatures without the need for fuel or large supplies of electricity. They sometimes employ a large parabolic array of mirrors (some facilities are several stories high) to focus light to a high intensity. The Olympic torch that is carried around the host country of the Olympic Games is lit by a burning glass, at the site of ancient Olympia in Greece. Burning glass A burning glass or burning lens is a large convex lens that can concentrate the sun's rays onto a small area, heating up the area and thus resulting in ignition of the exposed surface. Burning
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