Play with the program in that link a little. You can change dates, drag the cursor to your house, all kinds of stuff. A very instructive view is "path + rays." After playing with it for a while, you will realize the sun is so far south in the winter that as long as you long wall is pretty much south, it is no biggie.

Here is a link that might be useful: Sun position calculator

Wow! Have been looking for this sort of calculator for ages. Thank you, Tom. And you too, Steve, for asking.

Tom - That was one of the sites I was using, just not sure how to use the data. I am going to play with it some more but good to know that just worrying about south is enough.

A couple of the other sites I was looking at in case you and others are interested are:

http://sunrisesunset.com/
http://magnetic-declination.com/#