Olof Celsius (the elder) (July 19, 1670 – June 24, 1756) was a Swedish botanist, philologist and clergyman, He was a professor at Uppsala University, Sweden. Celsius was a mentor of the botanist and scientist Carolus Linnaeus. Celsius wrote his most famous book on biblical plants, Hierobotanicos, in 1745-47.
Olof Celsius's nephew Anders Celsius was an astronomer who invented a temperature scale where 0 represented the boiling point of water and 100 represented the freezing point of water. Carl Linnaeus in 1744 reversed the scale to create the centigrade scale, renamed in 1948 to the Celsius scale in use today.
Olof Celsius was made a member of the Royal Swedish Academy of Sciences in 1739.
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