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  2. Limiting magnitude - Wikipedia

    en.wikipedia.org/wiki/Limiting_magnitude

    The limiting magnitude will depend on the observer, and will increase with the eye's dark adaptation. On a relatively clear sky, the limiting visibility will be about 6th magnitude. [2] However, the limiting visibility is 7th magnitude for faint stars visible from dark rural areas located 200 km (120 mi) from major cities. [3] (See the Bortle scale