From pyr- + helio- + -metry. pyrheliometry (uncountable) (astronomy) The study (and measurement) of solar radiation using a pyrheliometer....
From pyrheliometric + -ally. pyrheliometrically (not comparable) By means of pyrheliometry....
(plural pyrheliometers) A device that measures the intensity of solar radiation received on the surface of the earth. pyrheliometry measuring device...