NavList:

If one can see the Moon, then one can point out the Sun (usually somewhere below the horizon) by close observation of the terminator, after which one can point the hour hand of the clock to that (invisible) Sun and find the north/south axis the same way one does when using the Sun/clock method during the day.

This approach demands some "3D" insights to more or less find out the Sun direction. It will break down when approaching the equator, but the Sun/clock method will also break down there.

rgds,

-alex-

ps - the 5 degree tilt of the lunar orbit wrt ecliptic slightly adds to the problem of using the horns of the moon only.