Contexte Saisons     This model is not to scale. The eccentricity is only 1/120 and would not be visible in the sketch. Zones climatiques     Different climatic zones within the Himalayan region. ZCIT (Zone de convergence intertropicale)     Intertropical convergence. Alizés     Trade wind circulation. Satellites météorologiques     The first launch of a second generation of Meteosat satellites was in 2002. The opportunity to analyse the atmosphere and its trace gasses was enhanced with these satellites.