Mannheim hours
In meteorology and climatic geography, Mannheim hours refer to the times of day 7, 2 and 9 p.m. ( MON ), when certain weather data was collected in weather stations around the world using standardized methods or is still partly collected. The data collected for the Mannheim Lessons include wind speed , wind direction , air pressure , humidity and air temperature .
The worldwide collection of meteorological data in measuring networks at fixed times of the day and with standardized measuring instruments was introduced by the meteorologist Johann Jakob Hemmer (1733–1790) in order to obtain comparable results for different places and years. When analyzing the data, a mean value is sometimes formed for the entire day. For example, the daily mean temperature is calculated . In Hemmer's system, the data from 9 p.m. was calculated twice in order to save the observers a fourth measurement during the night.
The name Mannheimer Stunden goes back to the fact that Johann Jakob Hemmer collected and then published the data of the first international weather measurement network he was in charge of in Mannheim . The operating company of the measuring network, the Palatinate Meteorological Society ( Societas Meteorologica Palatina ), which was founded in 1780 by Elector Karl Theodor , was at home in Mannheim .
Individual evidence
- ^ Societas Meteorologica Palatina (ed.): Ephemerides Societatis Meteorologicae Palatinae. observationes anni 1782. Manheimii: Soc., 1784, urn : nbn: de: bvb: 19-epub-12714-0