Experiments prove that, without the sun or the moon(or landmarks) as a fixed guide, lots of small errors add up over time so the brain can't correctly identify the "straight ahead" direction.To just get out of somewhere, pick a spot on the horizon and just head for it.
There are several ways to find directions in the dark, and by far the best is to establish north using the stars.Most people can identify the Plough, which is part of Ursa Major.It looks a lot like a pan.
The Plough rotates (旋转) through the sky, but let's imagine the pan lying horizontally, with its handle on the left.You need to trace a line from the star at the right-hand base of the pan through the star at the right-hand rim (边沿), and follow it upwards; the North Star is roughly five times the distance between those two 'pointer" stars.Then drop a vertical line from the North Star to the horizon and that's north.
"Tonight is very cloudy and I can't see the Plough." Maybe luckily, it is quite windy.Keep in mind that almost all of our weather comes from a south-westernly direction.(This only works if you are in the British Isles.) To find..the direction, you can throw light bits of dried-out grass in the air and see which way they blow; or, if there are clouds and patches ofclear sky, see which way they blow across the stars.You can also get an idea of direction from leggy plants.If they look as if they have been blown over, they will probably be pointing north-east.If they are simply leaning in one direction as they grow, there's a good chance that it is south (they will be reaching towards the sun).
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