2011World Meteorological Day - First Day Cover

Meteorology, the science of the Earth’s atmosphere and changes in it, has now developed into a science that is very important for life of all humanity on Earth. The first book with a description and interpretation of weather phenomena was Aristotle’s "Meteorologica“ (340 BC). In the early 17 century the first instrumental observations began, and the main instruments for implementing those observations and measurements were the barometer, hygrometer and thermometer. The development of meteorology, and the possibility of its usage in everyday life, has inspired the formation of the first meteorological services and international cooperation.