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What is "actinometry"

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actinometry
The Collaborative International Dictionary
Actinometry

Actinometry \Ac`ti*nom"e*try\, n.

  1. The measurement of the force of solar radiation.
    --Maury.

  2. The measurement of the chemical or actinic energy of light.
    --Abney.

Wiktionary
actinometry

n. 1 the measurement of the heating power of electromagnetic radiation, especially that of solar radiation 2 the measurement of the chemical or actinic energy of light

WordNet
actinometry

n. measuring the intensity of electromagnetic radiation (especially of the sun's rays)