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Absolute calibration of a spectrometer using terrestrial solar radiation.

We present a method to provide absolute intensity calibration of a common low-resolution, wideband optical spectrometer. Terrestrial solar radiation is employed as the source of illumination, and the spectrometer output is compared to a solar spectral standard to determine its calibration. Over 3  days of observation, the procedure is demonstrated to yield reproducible results. Other evidence of calibration accuracy is presented.