Abstract
1. On the basis of Planck's radiation law precise formulas have been obtained for computing the true temperature of a nonblack body from its luminance temperature and emissivity factor. 2) Precise formulas have also been obtained for calculating the color temperature of a nonblack body from its luminance temperature and color emissivity factor. 3) Approximate formulas have been obtained which relate the color and true temperatures of an actual body and provide the computation of the color and true temperatures with the required precision. 4) Approximate formulas have been obtained which provide the computation of the color temperature of a nonblack body with the required precision from two measured luminance temperatures of this body.
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