The ideal angle at which to position a southfacing solar collector (in the Northern Hemisphere) or a north-facing collector (in the Southern Hemisphere) is your latitude plus 10°.
Looks like I'm at a touch over 32d latitude, which makes 42d the ideal angle. That's close enough to the 45d SWAG that I shouldn't have even bothered to note it...except that it's neat to know someone cared enough to make a recommendation.
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