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X2 Allan's advice re the Sky Quality Meter. We have dark site readings of 21.77 at Bretti NSW which is the darkest location i have measured personally with the SQM. You can read about how the SQM calculates the darkness value on the Unihedron website. You know your in a truly dark site when the light from the milky way starts affecting the SQM reading, effectively the light pollution from the stars.
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