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Some sites, like Mike's description of Joshua Tree above, have such radically different darkness conditions in different quadrants that they're difficult to categorize.

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Indeed they do. In fact, that's pretty much the norm in the American West, where large metropolitan areas often end abruptly at federally owned wildnerness land.

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Tony Flanders

eyeglasses
6x15 and 8x32 monoculars
8x25, 7x35, 10x30 IS, 10x50, and 15x70 binoculars
70mm and 100mm achromatic refractors
4.5", 7", and 12.5" Dobs

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