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30 years ago the light dome of Sydney was visible at 100 nautical miles (182km) as I witnessed when on route from Port Chalmers to Sydney while standing the 4-8 watch.
The Southern Highlands is darker than the Sydney Basin, even my preferred observing site 15km west of Mittagong cops the glow of Sydney - I just do not look low in the NE.
But it is a bit more than 30 minutes drive. I would think that anyone from Sydney would have to drive at least 1 hour for reasonable skies.
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