Estimation of a

Instant solar radiation is considered as the most important parameter in the performance prediction of various solar devices. It may prove an important parameter for a building of design and agriculture. But the availability of such important data is very scarce and often not readily available. As a result, design of solar systems may not be proper for its efficient functioning [1, 2, 3]. Various relations have been developed to measure monthly mean global solar radiation with the help of different parameters. For example the first attempt at estimating of solar radiation was due to Angdtrom, who suggested that it could be related to the amount of sunshine by a simple linear relation in following:

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