The aim of the International Pyrheliometer Comparisons which take place
every 5 years at the WRC in Davos is to ensure the world-wide transfer of the
World Radiometric Reference.
During this event, all participants bring their instruments, solar-tracking
and data acquisition systems to Davos to conduct simultaneous solar radiation measurements
with the World Standard Group.
The IPC-IX took place from 25 Sept to 13 Oct 2000 in Davos. There were 65 participants
with a total of 85 instruments. Fifty of those instruments had already
taken part in the IPC-VIII in 1995.