Ozone layer radiation was matched to only one known chemical, ozone. Its properties were explored in detail by the British meteorologist G. M. B. Dobson, who developed a simple spectrophotometer (the Dobsonmeter) that could be used to measure stratospheric ozone from the ground. Between 1928 and 1958, Dobson established a worldwide network of ozone monitoring stations, which continue to operate to this day. The "Dobson unit", a convenient measure of the amount of ozone overhead, is named in his honor. The ozone layer absorbs 97 to 99 percent of the Sun's medium-frequency ultraviolet light (from about 200 nm to 315 nm wavelength),
The Layer Quaternity and role of the quaternity in religious symbolism is applicable to the Layer Quaternity. To Jung the quaternity was a natural expression of differentiation which always represents a totality, citing the four elements, the four seasons, the ancient Greek schemata of the four humours, and the four temperaments, as well as the four Evangelists with their respective emblems in the form of the tetramorph in Christian iconography, as examples. The symbolism of the four entities of the Layer Quaternity exemplify Jung's observation that individuation develops through psychic qualities consisting of two pairs of opposites, which are often polarised to each