Find the declination and apparent solar time for Freeport, Maine, latitude 43.85°, longitude 70.13°, on October 21 at 4:00 pm.
Table 2.2: Apparent Solar Irradiation A, Atmospheric Extinction Coefficient B, and Ratio of Diffuse Radiation on a Horizontal Surface to Direct Normal Irradiation C in the Northern Hemisphere
Date Day of year (N) A (W/m2) B C
Jan 21 21 1230 0.142 0.058
Feb 21 52 1215 0.144 0.060
Mar 21 80 1186 0.156 0.071
Apr 21 111 1136 0.180 0.097
May 21 141 1104 0.196 0.121
Jun 21 172 1088 0.205 0.134
Jul 21 202 1085 0.207 0.136
Aug 21 233 1107 0.201 0.122
Sep 21 264 1152 0.177 0.092
Oct 21 294 1193 0.160 0.073
Nov 21 325 1221 0.149 0.063
Dec 21 355 1234 0.142 0.057