Astronomical weather station
The earliest meteorological measurements in Denmark were taken in the Round Tower Observatory in the mid- 18th century. Temperature and pressure were measured and the weather meticulously described.
But what has astronomy to do with the weather? Well, at the time the Round Tower was built it was believed that the weather depended on the positions of the planets, so the astronomers prepared weather forecasts for the year ahead. However, around 1700, astronomers established that the planets and the weather were unconnected. Weather forecasts were popular, however, and it seemed natural to start taking the new meteorological measurements from the old astronomical weather station.