Christer Fuglesang in recognition of Anders Celsius, the Swedish 18th century astronomer who invented the Celsius temperature scale. Total EVA time during STS-116: 18 hours and 15 minutes. Fuglesang, once a Swedish national Frisbee champion, held the national title in "maximum time aloft" in 1978, and subsequently competed in the 1981 World Frisbee Championship. Fuglesang took one of his personal frisbees to the International Space Station. On Dec 15 in 2006, he set a new "world record" for Time Aloft by freefloating a spinning frisbee for 20 seconds in the microgravity environment of the ISS. It was done during a live broadcast
Celsius differences between temperatures or their uncertainties (e.g. "The output of the heat exchanger is hotter by 40 degrees Celsius", and "Our standard uncertainty is ±3 °C"). Because of this dual usage, one must not rely upon the unit name or its symbol to denote that a quantity is a temperature interval; it must be unambiguous through context or explicit statement that the quantity is an interval. This is sometimes solved by using the symbol °C (pronounced "degrees Celsius") for a temperature, and C° (pronounced "Celsius degrees") for a temperature interval, although this usage is non-standard. Another way to express the