You can also take bearings at noon (standard time, not daylight saving) to find south. It may be rough, depending on your position in your time zone, but it's close enough.

None of this celestial navigation stuff is worth much for 9-10 months of the year here in the Pacific NW west of the Cascades. You might have to wait a week for a clear day or night! However, with a thin twig you can usually get a shadow to fall on a reflective surface; if you do this at noon (see above) you can locate south. I've navigated in the Rockies without a compass, but I sure wouldn't want to do that out here!

Observing which side of a tree the moss grows to find north doesn't work here either--it grows on all sides of the tree!