Hi Narayan,
I'm not familiar with the area but looking at the map, it's only a few km from Gosford. It depends what you mean by "reasonably dark?"
I can't imagine it will be great but certainly darker than Sydney.
You can see a significant Sydney light pollution dome visible from the ASNSW site north of Bathurst. Wiruna is at least double the radial distance from Sydney than Glenworth Valley. Heck, I can even record a faint glow photographically from Sydney from my place and I'm 250km west of Sydney.
Your signature says Sydney. Do you live at Gosford or in central Sydney? I would think if you do live in Sydney, you'd be better heading out on the Hume or Great Western Highway's. Put more distance between you and Sydney.
cheers
Joe
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