This calculator determines the intensity of radiation falling on a horizontal surface at any time of the day in any location in the world. The primary use of this calculator is to determine the need for recalibration of radiation sensors. It is most accurate when used near solar noon in the summer  months.

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CLEAR SKY CALCULATOR FOR PYRANOMETER

CLEAR SKY CALCULATOR FOR QUANTUM SENSORS

        SHORTWAVE RADIATION          PHOTOSYNTHETIC PHOTON FLUX