You are planning to install a solar panel in the city of Essex, ON. The latitude and longitude of the city are 42.17
∘
N and 82.82
∘
W, respectively. The solar declination is 24.6
∘
in April 21 . Corresponding to the earth axis rotation, you need to find the relation among the tilt angle, latitude and solar declination. Then calculate the tilt angle for the solar panel on that day to get the maximum output. In addition, what should be the optimal tilt angle in summer and winter?