|
You can easily confirm the figure, pick a +6.8 mag star from a star atlas that will be as close as possible to zenith(directly overhead) and see if you can spot it.
If not, try a +6.7, then a +6.6....
I found that even on nights of apparently perfect seeing, I can see a +6.0 as a steady point, and then a +6.1 as fading from visible for a few seconds to gone for a few secs to visible again and took that as my threshold.
|