The first known Swedish document reporting temperatures in this modern `` forward '' Celsius scale is the paper `` Hortus Upsaliensis '' dated 16 December 1745 that Linnaeus wrote to a student of his , Samuel Nauclér .
The first known document reporting temperatures in this modern `` forward '' Celsius scale is the paper `` Hortus Upsaliensis '' dated 16 December 1745 that Linnaeus wrote to a student of his , Samuel Nauclér .