The simplest way is to get a star atlas that shows the magnitudes of the
stars that it displays, and see what magnitude you can see down to. Basic
atlases that go down to mag 6 are quite cheap. You could probably
download and print one from the internet free. A dark site will allow you
to see stars down to around mag 5.5 to 6.5. I live on the edge of a small town, and looking over the town I can see down to around 4 to 4.5.
Looking away from town I can see down to around 4.5 to 5.
raymo
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