pyranometer
From Glossary of Meteorology
(Sometimes called solarimeter.) General name for the class of actinometers that measure the combined intensity of incoming direct solar radiation and diffuse sky radiation.
The pyranometer consists of a recorder and a radiation sensing element that is mounted so that it views the entire sky (radiation from the solid angle 2π on a plane surface).
See pyrheliometer, Robitzsch actinograph, albedometer.
