pyranometer
radiograph
spectrohelioscope
pyrheliometer
roentgenometer
spectroheliometer
spectroheliokinematograph
telespectrograph
absorptiometer
photospectroradiometer
solar telescope
pyrheliometry
dosimeter
thoracometer
langley
telespectroradiometer
telephotometer
transilluminator
reflector
spectrofluorometric
coronograph
photoheliograph
irradiometer
radar astronomy
sunburst
fluorophotometer
spectroreflectometer
astronomy satellite
radiospectrometer
phototelescopic
ionization tube
phototachymetric
ionization chamber
sunphotometer
fadometer
light dependent resistor
photonephelometer
spectroradiometric
scintigram
fluorospectrometer
sampler
radio observation
sampling station
heliograph
goniophotometer
Geiger counter
tachygraphometer
focimeter
startracker
polariscope