Anders Celsius

He was born in 1701 and he deat in 1744. He was a Swedish astronomer, he was the first who proposed the centigrade thermometer, which has a scale of 100 degrees that separate the boiling and freezing water. From 1730-1744 he was professor of astronomy at the University of Uppsala, built the observatory in this city in 1740, and was appointed its director. In 1733 he published his collection of 316 observations on the aurora borealis and in 1737 was part of the French expedition organized to measure a degree of latitude in the polar regions.