I lived & worked in Tokyo for about 19.5 yrs. My friends would drive to Chiba (a golf course conveniently named Cosmo Classic GC) & we asked for permission to use their car park. It’s about Bortle 6 skies with a major glow from the Kawasaki factories but the east & south were decently dark (peninsula surrounded by the Pacific Ocean).
One can get darker Bortle 2 skies driving up to the mountains but would have to keep in mind of bears.
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