Research Article
Estimating Angstrom-Prescott Coefficients for India and Developing a Correlation between Sunshine Hours and Global Solar Radiation for India
Table 1
Estimated angles of declination for various months in a year.
| Month |
d for ith day of the month | For the average day of the month | Date | d, day of the year | , angle of declination |
| January | | 17 | 17 | –20.9 | February | | 16 | 47 | –13.0 | March | | 16 | 75 | –2.4 | April | | 15 | 105 | 9.4 | May | | 15 | 135 | 18.8 | June | | 11 | 162 | 23.1 | July | | 17 | 198 | 21.2 | August | | 16 | 228 | 13.5 | September | | 15 | 258 | 2.2 | October | | 15 | 288 | –9.6 | November | | 14 | 318 | –18.9 | December | | 10 | 344 | –23.0 |
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