Ok, for all of the math whizzes and astronomy experts out there... We're trying to figure out the best coop placement on our property. We can't move too far north in our yard because of the raised garden beds, short fencing (too open to alley), etc. At the same time, we need to be sure that we are far enough away from our neighbor's lot to the south that his large evergreens won't leave the coop in a deep freeze of shade this winter. So if I go outside at noon tomorrow and measure the length of the evergreens' shadows, what equation can I use to calculate their length at the winter solstice? (Obviously, I can repeat the measurements at the summer solstice in a couple weeks to improve accuracy.) BTW, our latitude is approx. 40 degrees. Thanks, and a gold star for anyone with the correct answer!