Ozone–oxygen cycle Ozone–oxygen cycle The ozone–oxygen cycle is the process by which ozone is continually regenerated in Earth's stratosphere, converting ultraviolet radiation (UV) into heat. In 1930 Sydney Chapman resolved the chemistry involved. The process is commonly called the Chapman cycle by atmospheric scientists. Most of the ozone production occurs in the tropical upper stratosphere and mesosphere. The total mass of ozone produced per day over the globe is about 400 million metric tons. The global mass of ozone is relatively constant at about 3 billion metric tons, meaning the Sun produces about 12% of the ozone layer each day. And if
The City of the Sun to observe the stars and, using astronomical instruments, to take account of all their movements. It is their job to indicate the times most favorable for generation and for agricultural labors, acting in this way as intermediaries between God and human beings. In Trento's Civic Library, there is kept a 1602 manuscript of "The City of the Sun" (shelf mark BCT1-1538), discovered in 1943 by Italian historian Luigi Firpo. It is considered the most ancient manuscript copy that has survived to present time. The text arrived at the Library through the baron Antonio Mazzetti 's (1781–1841) bequest. He was a