I've also used a Solar Path Finder, a very basic device that more or less lets you over lay via a reflection, your site and look at what is going to give you shading at what time of day for the whole year.
I think you can also get an Iphone app that does the same kind of thing then using GPS it figures out your sun hours and spits out a bunch of info for you.
it's really neat being able to use these devices to see where the sun is going to be in the sky at any one point in time on any day of the year.
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