The law of Buys Ballot

1817-90, Dutch meteorologist who organized and standardized a meteorological system.
This law states that, in the Northern Hemisphere, if one stands with his back to the wind, the area of low pressure is to his left. In the Southern Hemisphere the reverse is true. This cause can be found in the corkscrew deflection of teh wind caused by the earth's rotation. I learned this law at school 25 years ago.