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I would imagine you could use multiple ldr's (inside varying lengths of tube, mentioned above) at different permanent angles, and check the amount of light (voltage to ldr) at the different sun positions if you kept the device in a fixed location. Or also if you didn't use multiple ldr, you could use one tube, and pre messure the light amounts during different angles of sun, and reference those values in your code. I guess it would work more like a digital sundial, but for sun angle. I think a device that actually determined the sun's angle at random geographic locations would have a lot more brainstorming...
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