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G'Day OOO,
I don't think it will make your skies actually darker. But your plan to exclude direct light that affects your night vision is sound, so it may make the sky appear darker.
I have a similar problem at my home, but my back fence is adjacent a street light on an intersection. I'd have to build a light screen of considerable height to achieve what you're trying to do, and it would obscure probably 1/3 of the sky to the east... include the trees in my yard and I'm left with about 1/3 of the sky to view at zenith. Hence I drive out of town a lot, unless the moon is up and I'm going to view or image it.
Al.
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