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What is a The Bortle scale? The Bortle scale (created by astronomer John E. Bortle in 2001) is a simple 1-9 system that measures how dark (or light-polluted) your night sky really is. Class 1 = the purest, darkest skies on Earth; Class 9 = bright inner-city glow where only a handful of stars fight through. Most of us live in Bortle 4-8: the Milky Way is faint or washed out, faint deep-sky objects vanish, and the sky has an orange/ gray haze from streetlights. But Bortle Class 1? That's next leve
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What is a The Bortle scale? The Bortle scale (created by astronomer John E. Bortle in 2001) is a simple 1-9 system that measures how dark (or light-polluted) your night sky really is. Class 1 = the purest, darkest skies on Earth; Class 9 = bright inner-city glow where only a handful of stars fight through. Most of us live in Bortle 4-8: the Milky Way is faint or washed out, faint deep-sky objects vanish, and the sky has an orange/ gray haze from streetlights. But Bortle Class 1? That's next leve
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