Abstract
The relationship between sunshine and cloudiness has been studied, by utilising sunshine and cloudiness data for period 1953-1965 in respect of 20 stations covering the Indian latitudes. Regression analysis has been carried out and regression constants have been derived. The total of 2995 samples from all the stations for the 12 months of the year has yielded as high a correlation factor as 0.87.
 The estimated values of bright hours of sunshine agree very favourably with those actually observed. The cloud observations can thus be reliably utilized to supplement the instrumental measurements of sunshine to provide sufficient data for the study of climatology of duration of bright sunshine over India.
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