Contexte   This model is not to scale. The eccentricity is only 1/120 and would not be visible in the sketch. Saisons     Summer Northern hemisphere.   Summer Northern hemisphere.   Summer Southern hemisphere. Zones climatiques     Summer Southern hemisphere. ZCIT (Zone de convergence intertropicale)     Trade wind circulation.   Intertropical convergence. 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.