Quote:
Originally Posted by avandonk
Clockwise derives its direction from sundials in the northern hemisphere.
In the southern hemisphere sundials run anticlockwise.
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In the northern hemisphere winds around high and low pressure systems follow a right hand rule. In the southern a left hand rule.
Make a fist using the appropriate hand with thumb out.
Low pressure means rising air. Point the thumb up.
High pressure means descending air. Point the thumb down.
Winds will rotate in the direction of the fingers.
Of course left, right, up and down are all just conventions too.