The aim of the International Pyrheliometer Comparisons is to ensure the world - wide transfer of the World Radiometric Reference .
The International Pyrheliometer Comparisons take place every 5 years at the World Radiation Centre in Davos .
The aim of the International Pyrheliometer Comparisons , which take place every 5 years at the World Radiation Centre in Davos , is to ensure the world - wide transfer of the World Radiometric Reference .