Anders Celsius magnitude (a measure of brightness) of certain stars. This was the first attempt to measure the intensity of starlight with a tool other than the human eye. He made observations of eclipses and various astronomical objects and published catalogues of carefully determined magnitudes for some 300 stars using his own photometric system (mean error=0.4 mag). Celsius was the first to perform and publish careful experiments aiming at the definition of an international temperature scale on scientific grounds. In his Swedish paper "Observations of two persistent degrees on a thermometer" he reports on experiments to check that the freezing point is
Uppsala University the previous century, but eventually a larger emphasis on sciences and practically useful knowledge developed. The innovative mathematician and physicist Samuel Klingenstierna (1698–1765) was made a professor in 1728, the physicist and astronomer Anders Celsius in 1729, and Carl Linnaeus was made professor of Medicine with Botany in 1741. The university was not immune to the parliamentary struggle between the parties known as the "Hats" and the "Caps", with the former having a preference for hard sciences and practical knowledge. The Hat government then in power established a chair in economics ("Œconomia publica") in 1741 and called Anders Berch as