Using 2in^2 mirrors<br>solar constant 1000W/m^2 on the earth surface<br>sc = .1W/cm^2 = .6452W/in^2<br>J = (mW/cm^2 X area X (time in seconds))/1000<br>working in in^2<br>J = ((mW/in^2) (area) (time in seconds)) / 1000<br>J = ((.6452) (area) (900))/1000<br>mirror reflectiveness: 75%<p><table border=1><tr><td>row</td> <td># mirrors</td><td>total mirrors</td><td>area</td> <td>watts</td> <td>Joules/15min</td></tr><tr><td>1</td><td>8</td><td>8</td><td>32</td><td>15.4848</td><td>13.93632</td></tr><tr><td>2</td><td>16</td><td>24</td><td>96</td><td>46.4544</td><td>41.80896</td></tr><tr><td>3</td><td>24</td><td>48</td><td>192</td><td>92.9088</td><td>83.61792</td></tr><tr><td>4</td><td>33</td><td>81</td><td>324</td><td>156.7836</td><td>141.10524</td></tr><tr><td>5</td><td>42</td><td>123</td><td>492</td><td>238.0788</td><td>214.27092</td></tr><tr><td>6</td><td>50</td><td>173</td><td>692</td><td>334.8588</td><td>301.37292</td></tr><tr><td>7</td><td>58</td><td>231</td><td>924</td><td>447.1236</td><td>402.41124</td></tr><tr><td>8</td><td>66</td><td>297</td><td>1188</td><td>574.8732</td><td>517.38588</td></tr></table><p>
Latitude:  26° 10' North  <br>
Longitude:  127° 40' East