Test 2: Cygnus and Lyra
These two constellations should be nearly overhead. Mark the faintest star you can see on the diagram.
Test 3: The Great Square of Pegasus
Look over the trees to the northeast. You should see a large diamond defined by four bright stars: this is the Great Square of Pegasus, rising up on one corner. How many stars can you see which fall INSIDE the square? Count them, and then use this table to determine the magnitude of the faintest one.
If you can see this many stars the faintest one is ------------------------------ --------------------- 1 mag 4.5 2 - 4 5.0 5 - 7 5.5 8 - 13 6.0 18 - 37 6.5
The number counts were taken from the web site
http://www.astrosurf.com/universia/Nuit2Anglais.htmwhich provides additional tests of limiting magnitude.