High Quality Content by WIKIPEDIA articles! Anders Celsius (27 November 1701 - 25 April 1744) was a Swedish astronomer. He was professor of astronomy at Uppsala University from 1730 to 1744, but traveled from 1732 to 1735 visiting notable observatories in Germany, Italy and France. He founded the Uppsala Astronomical Observatory in 1741, and in 1742 he proposed the Celsius temperature scale which takes his name. The scale was later reversed in 1745 by Carl Linnaeus, one year after Celsius' death.