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As a very rough guide I use. My home location has semi rural skies which are reasonably dark to the west and less dark to the Sydney facing east.
I can see the Milky Way easily, I can see the LMC and SMC not so easily and the stars are fairly clear in general.
But when I go to my dark sky site which per the light pollution map is in a dark shadow area so almost as dark as it gets the stars take on a fiery aspect, the Milky Way a 3D almost throbbing aspect and the LMC and SMC are quite easy to see.
So the firey star aspect is my guide. Not just bright points but little fires.
Greg.
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