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A search for discontinuity in the sky twilight brightness at differentwavelengths and different solar depressions for altitudes 0, 5, 10, 30, 50 & 70degrees is done. It is found that the logarithmic of difference in thebrightness log (I1-I2) of two similar patches lying at solar and anti-solarverticals are not suffering of any discontinuity, when plotted versus sun'sdepression. Whatever, the ratio I1/I2 shows that there is discontinuity in thecurves at altitudes less than or equal 30 degrees. While for altitudes 50 & 70degrees slight patches of discontinuities have been detected. The phenomenon ofdiscontinuities may be referred to the changes in the sky twilight brightnessdue to the effect of the Earth's shadow on diffusing and luminescent layers inthe upper atmosphere.

Discontinuity in the Brightness of the Twilight Sky at Different Wavelengths