Question

How much would be the angle of declination on DECEMBER 21 at 0900 h (LAT). The collector s located in New Delhi (28^o35’N, 77^o12’E) and is tilted at an angle of 36^o with the horizontal and is pointing south?

(a) -44.28^o

(b) -28.92^o

(c) -23.45^o

(d) -42.22^o

I had been asked this question in a national level competition.

The origin of the question is Solar Radiation Measurement in portion Solar Energy of Energy Engineering

Answer 1

The correct answer is (c) -23.45^o

For explanation: In the case γ = 0^o, on December 21, n=355