CERN-LEP. Measurement of the charge asymmetry in hadronic Z0 decays produced in e+ e- collisions. Data come from the 1989 - 1990 LEP running by the ALEPH collaboration. The data are divided into two hemispheres by a plane perpendicular to the thrust axis and the mean difference in the momentum weighted charges between the two hemispheres is measured. In the framework of the standard model this is interpreted as a measurement of sin2tw, the electroweak mixing angle, and the ratio of the vector to axial vector coupling constants.