Celsius is named after a Swedish astronomer
and physicist Anders Celsius, who lived from 1701 to 1744.
He proposed in 1742 to divide the temperature
scale into 100 degrees, with 0 degrees standig for the boiling
point of water and 100 degrees standing for the freezing
point of water.
Luckily this was reversed so the definition of Celsius
0 degrees Celsius is the freezing point of water
100 degrees Celsius is the boiling point of water