The eponym for the term Fahrenheit or Celsius is Anders Celsius. He was a Swedish astronomer and physicist who developed the Celsius temperature scale in 1742. The scale is based on the freezing and boiling points of water, with 0°C being the freezing point and 100°C being the boiling point. The Fahrenheit scale was developed by German physicist Daniel Gabriel Fahrenheit in 1724 and is based on three fixed points of temperature.