Convert from degree Fahrenheit to degree Celsius

Unit Definition (degree Fahrenheit)
Degrees Fahrenheit is a common unit of temperature still widely used today. The unit was defined by the German physicist Daniel Fahrenheit. Fahrenheit set 0° at the coldest temperature he could conveniently achieve using an ice and salt mixture, and it is said he intended to set 96°F as the temperature of the human body. On his scale, the freezing point of water (at 1atm.) turned out to be ~32°F and the boiling point ~212°F. Eventually the scale was precisely defined by these two temperatures.

Unit Definition (degree Celsius)
Degree Celsius is the most common metric unit of temperature. It was named after the Swedish astronomer and physicist Anders Celsius. The freezing point of water (at 1atm.) was originally defined to be 0°C and the boiling point at 100°C. It should be noted that the scale of the two units, degrees Celsius and degrees Kelvin are actually the same, although degrees Celsius is actually offset by 273° when compared to the Kelvin scale. 0° Kelvin (-273°C) is defined at the point at which all molecular motion stops.